diff --git a/userfront/assets/translations/en.toml b/userfront/assets/translations/en.toml
index acc22ea8..26cf3641 100644
--- a/userfront/assets/translations/en.toml
+++ b/userfront/assets/translations/en.toml
@@ -137,6 +137,16 @@ title_generic = "An error occurred."
 title_with_code = "Error: {code}"
 type = "Error type: {type}"
 
+[msg.userfront.error.tenant]
+account = "Account"
+account_unknown = "Unknown"
+detail = "The currently signed-in account cannot access this application."
+load_failed = "We could not confirm the account details. Please try again."
+loading = "Loading the current account details."
+tenant = "Tenant"
+tenant_unknown = "Unknown"
+title = "Access restriction details"
+
 [msg.userfront.error.ory]
 "$normalizedCode" = "{error}"
 access_denied = "The user denied the consent request."
@@ -506,6 +516,7 @@ windows = "Desktop(Windows)"
 [ui.userfront.error]
 go_home = "Go Home"
 go_login = "Go Login"
+switch_account = "Sign in with another account"
 
 [ui.userfront.forgot]
 heading = "Forgot your password?"
diff --git a/userfront/assets/translations/ko.toml b/userfront/assets/translations/ko.toml
index 24f7ce3b..245ff0f3 100644
--- a/userfront/assets/translations/ko.toml
+++ b/userfront/assets/translations/ko.toml
@@ -78,6 +78,16 @@ title_generic = "오류가 발생했습니다"
 title_with_code = "오류: {code}"
 type = "오류 종류: {type}"
 
+[msg.userfront.error.tenant]
+account = "계정"
+account_unknown = "알 수 없음"
+detail = "현재 로그인된 계정은 이 애플리케이션에 접근할 수 없습니다."
+load_failed = "계정 정보를 확인하지 못했습니다. 다시 시도해 주세요."
+loading = "현재 계정 정보를 불러오는 중입니다."
+tenant = "소속 테넌트"
+tenant_unknown = "알 수 없음"
+title = "접근 제한 정보"
+
 [msg.userfront.forgot]
 description = "계정과 연결된 이메일 주소 또는 휴대폰 번호를 입력하시면, 비밀번호를 재설정할 수 있는 링크를 보내드립니다."
 dry_send = "drySend 모드: 실제 이메일/SMS는 발송되지 않습니다."
@@ -190,6 +200,7 @@ windows = "Desktop(Windows)"
 [ui.userfront.error]
 go_home = "홈으로 이동"
 go_login = "로그인으로 이동"
+switch_account = "다른 계정으로 로그인"
 
 [ui.userfront.forgot]
 heading = "비밀번호를 잊으셨나요?"
diff --git a/userfront/assets/translations/template.toml b/userfront/assets/translations/template.toml
index 8f8518a4..4418458f 100644
--- a/userfront/assets/translations/template.toml
+++ b/userfront/assets/translations/template.toml
@@ -50,6 +50,16 @@ title_generic = ""
 title_with_code = ""
 type = ""
 
+[msg.userfront.error.tenant]
+account = ""
+account_unknown = ""
+detail = ""
+load_failed = ""
+loading = ""
+tenant = ""
+tenant_unknown = ""
+title = ""
+
 [msg.userfront.forgot]
 description = ""
 dry_send = ""
@@ -162,6 +172,7 @@ windows = ""
 [ui.userfront.error]
 go_home = ""
 go_login = ""
+switch_account = ""
 
 [ui.userfront.forgot]
 heading = ""
diff --git a/userfront/lib/core/constants/error_whitelist.dart b/userfront/lib/core/constants/error_whitelist.dart
index 07a4ee87..af4e8558 100644
--- a/userfront/lib/core/constants/error_whitelist.dart
+++ b/userfront/lib/core/constants/error_whitelist.dart
@@ -8,6 +8,7 @@ const Map<String, String> internalErrorWhitelistMessages = {
   'not_found': '요청한 페이지를 찾을 수 없습니다.',
   'bad_request': '입력값을 확인해 주세요.',
   'password_or_email_mismatch': '이메일 혹은 비밀번호가 일치하지 않습니다.',
+  'tenant_not_allowed': '허용되지 않은 테넌트입니다.',
 };
 
 const Set<String> oryBypassErrorCodes = {
diff --git a/userfront/lib/features/auth/presentation/error_screen.dart b/userfront/lib/features/auth/presentation/error_screen.dart
index 7977c0b6..fcdab116 100644
--- a/userfront/lib/features/auth/presentation/error_screen.dart
+++ b/userfront/lib/features/auth/presentation/error_screen.dart
@@ -1,16 +1,20 @@
+import 'dart:async';
+
 import 'package:flutter/material.dart';
 import 'package:go_router/go_router.dart';
 import '../../../core/constants/error_whitelist.dart';
 import '../../../core/i18n/locale_utils.dart';
 import '../../../core/services/auth_proxy_service.dart';
+import '../../../core/services/logout_service.dart';
 import '../../../core/widgets/theme_toggle_button.dart';
 import 'package:userfront/i18n.dart';
 
-class ErrorScreen extends StatelessWidget {
+class ErrorScreen extends StatefulWidget {
   final String? errorId;
   final String? errorCode;
   final String? description;
   final bool? isProdOverride;
+  final Future<Map<String, dynamic>> Function()? sessionProfileLoader;
 
   const ErrorScreen({
     super.key,
@@ -18,20 +22,124 @@ class ErrorScreen extends StatelessWidget {
     this.errorCode,
     this.description,
     this.isProdOverride,
+    this.sessionProfileLoader,
   });
 
+  @override
+  State<ErrorScreen> createState() => _ErrorScreenState();
+}
+
+class _ErrorScreenState extends State<ErrorScreen> {
+  Map<String, dynamic>? _sessionProfile;
+  bool _isLoadingSessionProfile = false;
+  String? _sessionProfileError;
+
+  bool get _isTenantAccessBlocked =>
+      (widget.errorCode ?? '').trim() == 'tenant_not_allowed';
+
+  @override
+  void initState() {
+    super.initState();
+    if (_isTenantAccessBlocked) {
+      unawaited(_loadSessionProfile());
+    }
+  }
+
+  Future<void> _loadSessionProfile() async {
+    if (_isLoadingSessionProfile) {
+      return;
+    }
+    setState(() {
+      _isLoadingSessionProfile = true;
+      _sessionProfileError = null;
+    });
+    try {
+      final loader = widget.sessionProfileLoader ?? AuthProxyService.getMe;
+      final profile = await loader();
+      if (!mounted) {
+        return;
+      }
+      setState(() {
+        _sessionProfile = profile;
+      });
+    } catch (error) {
+      if (!mounted) {
+        return;
+      }
+      setState(() {
+        _sessionProfileError = error.toString();
+      });
+    } finally {
+      if (mounted) {
+        setState(() {
+          _isLoadingSessionProfile = false;
+        });
+      }
+    }
+  }
+
+  String _extractTenantLabel(Map<String, dynamic>? profile) {
+    if (profile == null) {
+      return '';
+    }
+
+    final tenant = profile['tenant'];
+    if (tenant is Map) {
+      final name = tenant['name']?.toString().trim() ?? '';
+      if (name.isNotEmpty) {
+        return name;
+      }
+      final slug = tenant['slug']?.toString().trim() ?? '';
+      if (slug.isNotEmpty) {
+        return slug;
+      }
+    }
+
+    final joinedTenants = profile['joinedTenants'];
+    if (joinedTenants is List) {
+      for (final item in joinedTenants) {
+        if (item is Map) {
+          final name = item['name']?.toString().trim() ?? '';
+          if (name.isNotEmpty) {
+            return name;
+          }
+          final slug = item['slug']?.toString().trim() ?? '';
+          if (slug.isNotEmpty) {
+            return slug;
+          }
+        }
+      }
+    }
+
+    final companyCode = profile['companyCode']?.toString().trim() ?? '';
+    if (companyCode.isNotEmpty) {
+      return companyCode;
+    }
+
+    return '';
+  }
+
+  Future<void> _switchAccount() async {
+    await LogoutService().logout();
+    if (!mounted) {
+      return;
+    }
+    context.go(buildLocalizedSigninPath(Uri.base));
+  }
+
   @override
   Widget build(BuildContext context) {
     final theme = Theme.of(context);
     final colorScheme = theme.colorScheme;
-    final isProd = isProdOverride ?? AuthProxyService.isProdEnv;
-    final normalizedCode = (errorCode ?? '').trim();
+    final isProd = widget.isProdOverride ?? AuthProxyService.isProdEnv;
+    final normalizedCode = (widget.errorCode ?? '').trim();
     final hasCode = normalizedCode.isNotEmpty;
     final internalWhitelistFallback =
         internalErrorWhitelistMessages[normalizedCode];
     final isInternalWhitelisted = internalWhitelistFallback != null;
     final isOryBypass = hasCode && oryBypassErrorCodes.contains(normalizedCode);
     final isKnownProdCode = hasCode && (isInternalWhitelisted || isOryBypass);
+    final isTenantAccessBlocked = normalizedCode == 'tenant_not_allowed';
     final errorType = isProd
         ? (isKnownProdCode ? normalizedCode : 'unknown_error')
         : (hasCode ? normalizedCode : 'unknown_error');
@@ -43,44 +151,55 @@ class ErrorScreen extends StatelessWidget {
                   params: {'code': normalizedCode},
                 )
               : tr('msg.userfront.error.title_generic'));
-    final detail = isProd
-        ? (isInternalWhitelisted
-              ? tr(
-                  'msg.userfront.error.whitelist.$normalizedCode',
-                  fallback: internalWhitelistFallback,
-                )
-              : (isOryBypass
-                    ? tr(
-                        'msg.userfront.error.ory.$normalizedCode',
-                        fallback: (description?.isNotEmpty == true)
-                            ? description
-                            : tr('msg.userfront.error.detail_request'),
-                      )
-                    : tr('msg.userfront.error.detail_contact')))
-        : ((description?.isNotEmpty == true)
-              ? description!
-              : (hasCode
-                    ? tr('msg.userfront.error.detail_generic')
-                    : tr('msg.userfront.error.detail_request')));
+    final detail = isTenantAccessBlocked
+        ? tr(
+            'msg.userfront.error.tenant.detail',
+            fallback:
+                '현재 로그인된 계정은 이 애플리케이션에 접근할 수 없습니다.',
+          )
+        : isProd
+            ? (isInternalWhitelisted
+                  ? tr(
+                      'msg.userfront.error.whitelist.$normalizedCode',
+                      fallback: internalWhitelistFallback,
+                    )
+                  : (isOryBypass
+                        ? tr(
+                            'msg.userfront.error.ory.$normalizedCode',
+                            fallback: (widget.description?.isNotEmpty == true)
+                                ? widget.description
+                                : tr('msg.userfront.error.detail_request'),
+                          )
+                        : tr('msg.userfront.error.detail_contact')))
+            : ((widget.description?.isNotEmpty == true)
+                  ? widget.description!
+                  : (hasCode
+                        ? tr('msg.userfront.error.detail_generic')
+                        : tr('msg.userfront.error.detail_request')));
+    final tenantLabel = _extractTenantLabel(_sessionProfile);
+    final emailLabel = _sessionProfile?['email']?.toString().trim() ?? '';
 
     return Scaffold(
       backgroundColor: colorScheme.surfaceContainerLowest,
-      body: Center(
-        child: ConstrainedBox(
-          constraints: const BoxConstraints(maxWidth: 560),
-          child: Card(
-            margin: const EdgeInsets.symmetric(horizontal: 24),
-            elevation: 0,
-            shape: RoundedRectangleBorder(
-              borderRadius: BorderRadius.circular(16),
-              side: BorderSide(color: colorScheme.outlineVariant),
-            ),
-            child: Padding(
-              padding: const EdgeInsets.fromLTRB(28, 28, 28, 24),
-              child: Column(
-                mainAxisSize: MainAxisSize.min,
-                crossAxisAlignment: CrossAxisAlignment.start,
-                children: [
+      body: SafeArea(
+        child: SingleChildScrollView(
+          padding: const EdgeInsets.symmetric(vertical: 24),
+          child: Center(
+            child: ConstrainedBox(
+              constraints: const BoxConstraints(maxWidth: 560),
+              child: Card(
+                margin: const EdgeInsets.symmetric(horizontal: 24),
+                elevation: 0,
+                shape: RoundedRectangleBorder(
+                  borderRadius: BorderRadius.circular(16),
+                  side: BorderSide(color: colorScheme.outlineVariant),
+                ),
+                child: Padding(
+                  padding: const EdgeInsets.fromLTRB(28, 28, 28, 24),
+                  child: Column(
+                    mainAxisSize: MainAxisSize.min,
+                    crossAxisAlignment: CrossAxisAlignment.start,
+                    children: [
                   Row(
                     children: [
                       Expanded(
@@ -103,6 +222,101 @@ class ErrorScreen extends StatelessWidget {
                       height: 1.5,
                     ),
                   ),
+                  if (isTenantAccessBlocked) ...[
+                    const SizedBox(height: 16),
+                    Container(
+                      width: double.infinity,
+                      padding: const EdgeInsets.all(16),
+                      decoration: BoxDecoration(
+                        color: colorScheme.surface,
+                        borderRadius: BorderRadius.circular(12),
+                        border: Border.all(color: colorScheme.outlineVariant),
+                      ),
+                      child: Column(
+                        crossAxisAlignment: CrossAxisAlignment.start,
+                        children: [
+                          Text(
+                            tr(
+                              'msg.userfront.error.tenant.title',
+                              fallback: '접근 제한 정보',
+                            ),
+                            style: theme.textTheme.titleSmall?.copyWith(
+                              fontWeight: FontWeight.w700,
+                            ),
+                          ),
+                          const SizedBox(height: 12),
+                          if (_isLoadingSessionProfile)
+                            Row(
+                              crossAxisAlignment: CrossAxisAlignment.start,
+                              children: [
+                                SizedBox(
+                                  width: 16,
+                                  height: 16,
+                                  child: CircularProgressIndicator(
+                                    strokeWidth: 2,
+                                    color: colorScheme.primary,
+                                  ),
+                                ),
+                                const SizedBox(width: 10),
+                                Flexible(
+                                  child: Text(
+                                    tr(
+                                      'msg.userfront.error.tenant.loading',
+                                      fallback:
+                                          '현재 계정 정보를 불러오는 중입니다.',
+                                    ),
+                                    style: theme.textTheme.bodySmall?.copyWith(
+                                      color: colorScheme.onSurfaceVariant,
+                                    ),
+                                  ),
+                                ),
+                              ],
+                            )
+                          else ...[
+                            _InfoRow(
+                              label: tr(
+                                'msg.userfront.error.tenant.account',
+                                fallback: '계정',
+                              ),
+                              value: emailLabel.isNotEmpty
+                                  ? emailLabel
+                                  : tr(
+                                      'msg.userfront.error.tenant.account_unknown',
+                                      fallback: '알 수 없음',
+                                    ),
+                            ),
+                            const SizedBox(height: 8),
+                            _InfoRow(
+                              label: tr(
+                                'msg.userfront.error.tenant.tenant',
+                                fallback: '소속 테넌트',
+                              ),
+                              value: tenantLabel.isNotEmpty
+                                  ? tenantLabel
+                                  : tr(
+                                      'msg.userfront.error.tenant.tenant_unknown',
+                                      fallback: '알 수 없음',
+                                    ),
+                            ),
+                            if (_sessionProfileError != null &&
+                                _sessionProfileError!.isNotEmpty) ...[
+                              const SizedBox(height: 12),
+                              Text(
+                                tr(
+                                  'msg.userfront.error.tenant.load_failed',
+                                  fallback:
+                                      '계정 정보를 확인하지 못했습니다. 다시 시도해 주세요.',
+                                ),
+                                style: theme.textTheme.bodySmall?.copyWith(
+                                  color: colorScheme.onSurfaceVariant,
+                                ),
+                              ),
+                            ],
+                          ],
+                        ],
+                      ),
+                    ),
+                  ],
                   const SizedBox(height: 12),
                   Text(
                     tr('msg.userfront.error.type', params: {'type': errorType}),
@@ -110,10 +324,11 @@ class ErrorScreen extends StatelessWidget {
                       color: colorScheme.onSurfaceVariant,
                     ),
                   ),
-                  if (errorId != null && errorId!.isNotEmpty) ...[
+                  if (widget.errorId != null && widget.errorId!.isNotEmpty) ...[
                     const SizedBox(height: 12),
                     Text(
-                      tr('msg.userfront.error.id', params: {'id': errorId!}),
+                      tr('msg.userfront.error.id',
+                          params: {'id': widget.errorId!}),
                       style: theme.textTheme.bodySmall?.copyWith(
                         color: colorScheme.onSurfaceVariant,
                       ),
@@ -125,7 +340,9 @@ class ErrorScreen extends StatelessWidget {
                     runSpacing: 12,
                     children: [
                       ElevatedButton(
-                        onPressed: () => context.go('/login'),
+                        onPressed: isTenantAccessBlocked
+                            ? _switchAccount
+                            : () => context.go('/login'),
                         style: ElevatedButton.styleFrom(
                           backgroundColor: colorScheme.primary,
                           foregroundColor: colorScheme.onPrimary,
@@ -137,7 +354,11 @@ class ErrorScreen extends StatelessWidget {
                             borderRadius: BorderRadius.circular(10),
                           ),
                         ),
-                        child: Text(tr('ui.userfront.error.go_login')),
+                        child: Text(
+                          isTenantAccessBlocked
+                              ? tr('ui.userfront.error.switch_account')
+                              : tr('ui.userfront.error.go_login'),
+                        ),
                       ),
                       OutlinedButton(
                         onPressed: () =>
@@ -157,7 +378,9 @@ class ErrorScreen extends StatelessWidget {
                       ),
                     ],
                   ),
-                ],
+                    ],
+                  ),
+                ),
               ),
             ),
           ),
@@ -166,3 +389,39 @@ class ErrorScreen extends StatelessWidget {
     );
   }
 }
+
+class _InfoRow extends StatelessWidget {
+  final String label;
+  final String value;
+
+  const _InfoRow({required this.label, required this.value});
+
+  @override
+  Widget build(BuildContext context) {
+    final theme = Theme.of(context);
+    final colorScheme = theme.colorScheme;
+    return Row(
+      crossAxisAlignment: CrossAxisAlignment.start,
+      children: [
+        SizedBox(
+          width: 100,
+          child: Text(
+            label,
+            style: theme.textTheme.bodySmall?.copyWith(
+              color: colorScheme.onSurfaceVariant,
+              fontWeight: FontWeight.w600,
+            ),
+          ),
+        ),
+        Expanded(
+          child: Text(
+            value,
+            style: theme.textTheme.bodySmall?.copyWith(
+              color: colorScheme.onSurface,
+            ),
+          ),
+        ),
+      ],
+    );
+  }
+}
diff --git a/userfront/lib/i18n_data.dart b/userfront/lib/i18n_data.dart
index 8d7f7d8e..8cc55f76 100644
--- a/userfront/lib/i18n_data.dart
+++ b/userfront/lib/i18n_data.dart
@@ -503,6 +503,16 @@ const Map<String, String> koStrings = {
   "msg.userfront.error.title_generic": "오류가 발생했습니다",
   "msg.userfront.error.title_with_code": "오류: {{code}}",
   "msg.userfront.error.type": "오류 종류: {{type}}",
+  "msg.userfront.error.tenant.account": "계정",
+  "msg.userfront.error.tenant.account_unknown": "알 수 없음",
+  "msg.userfront.error.tenant.detail":
+      "현재 로그인된 계정은 이 애플리케이션에 접근할 수 없습니다.",
+  "msg.userfront.error.tenant.load_failed":
+      "계정 정보를 확인하지 못했습니다. 다시 시도해 주세요.",
+  "msg.userfront.error.tenant.loading": "현재 계정 정보를 불러오는 중입니다.",
+  "msg.userfront.error.tenant.tenant": "소속 테넌트",
+  "msg.userfront.error.tenant.tenant_unknown": "알 수 없음",
+  "msg.userfront.error.tenant.title": "접근 제한 정보",
   "msg.userfront.error.whitelist.\"\$normalizedCode\"": "{{error}}",
   "msg.userfront.error.whitelist.bad_request": "입력값을 확인해 주세요.",
   "msg.userfront.error.whitelist.invalid_session": "세션이 만료되었습니다. 다시 로그인해 주세요.",
@@ -514,6 +524,7 @@ const Map<String, String> koStrings = {
       "재설정 링크가 만료되었습니다. 다시 요청해 주세요.",
   "msg.userfront.error.whitelist.recovery_invalid": "재설정 링크가 유효하지 않습니다.",
   "msg.userfront.error.whitelist.settings_disabled": "현재 계정 설정 화면은 준비 중입니다.",
+  "msg.userfront.error.whitelist.tenant_not_allowed": "허용되지 않은 테넌트입니다.",
   "msg.userfront.error.whitelist.verification_required":
       "추가 인증이 필요합니다. 안내에 따라 진행해 주세요.",
   "msg.userfront.forgot.description":
@@ -1738,6 +1749,7 @@ const Map<String, String> koStrings = {
   "ui.userfront.device.windows": "Desktop(Windows)",
   "ui.userfront.error.go_home": "홈으로 이동",
   "ui.userfront.error.go_login": "로그인으로 이동",
+  "ui.userfront.error.switch_account": "다른 계정으로 로그인",
   "ui.userfront.forgot.heading": "비밀번호를 잊으셨나요?",
   "ui.userfront.forgot.input_label": "이메일 또는 휴대폰 번호",
   "ui.userfront.forgot.submit": "재설정 링크 전송",
@@ -2436,6 +2448,16 @@ const Map<String, String> enStrings = {
   "msg.userfront.error.title_generic": "An error occurred.",
   "msg.userfront.error.title_with_code": "Error: {{code}}",
   "msg.userfront.error.type": "Error type: {{type}}",
+  "msg.userfront.error.tenant.account": "Account",
+  "msg.userfront.error.tenant.account_unknown": "Unknown",
+  "msg.userfront.error.tenant.detail":
+      "The currently signed-in account cannot access this application.",
+  "msg.userfront.error.tenant.load_failed":
+      "We could not confirm the account details. Please try again.",
+  "msg.userfront.error.tenant.loading": "Loading the current account details.",
+  "msg.userfront.error.tenant.tenant": "Tenant",
+  "msg.userfront.error.tenant.tenant_unknown": "Unknown",
+  "msg.userfront.error.tenant.title": "Access restriction details",
   "msg.userfront.error.whitelist.\"\$normalizedCode\"": "{{error}}",
   "msg.userfront.error.whitelist.bad_request": "Please check your input.",
   "msg.userfront.error.whitelist.invalid_session":
@@ -2452,6 +2474,8 @@ const Map<String, String> enStrings = {
       "The recovery link is invalid.",
   "msg.userfront.error.whitelist.settings_disabled":
       "Account settings are currently unavailable.",
+  "msg.userfront.error.whitelist.tenant_not_allowed":
+      "This tenant is not allowed.",
   "msg.userfront.error.whitelist.verification_required":
       "Additional verification is required. Please follow the instructions.",
   "msg.userfront.forgot.description":
@@ -3752,6 +3776,7 @@ const Map<String, String> enStrings = {
   "ui.userfront.device.windows": "Desktop(Windows)",
   "ui.userfront.error.go_home": "Go Home",
   "ui.userfront.error.go_login": "Go Login",
+  "ui.userfront.error.switch_account": "Sign in with another account",
   "ui.userfront.forgot.heading": "Forgot your password?",
   "ui.userfront.forgot.input_label": "Email address or phone number",
   "ui.userfront.forgot.submit": "Send reset link",
diff --git a/userfront/test/error_screen_test.dart b/userfront/test/error_screen_test.dart
index e80c7454..036c5aa2 100644
--- a/userfront/test/error_screen_test.dart
+++ b/userfront/test/error_screen_test.dart
@@ -9,6 +9,7 @@ Future<void> _pumpErrorScreen(
   String? errorCode,
   String? description,
   bool? isProdOverride,
+  Future<Map<String, dynamic>> Function()? sessionProfileLoader,
 }) async {
   await tester.pumpWidget(
     MaterialApp(
@@ -16,6 +17,7 @@ Future<void> _pumpErrorScreen(
         errorCode: errorCode,
         description: description,
         isProdOverride: isProdOverride,
+        sessionProfileLoader: sessionProfileLoader,
       ),
     ),
   );
@@ -193,4 +195,50 @@ void main() {
     expect(find.text(type), findsOneWidget);
     expect(find.text('원문 메시지'), findsNothing);
   });
+
+  testWidgets('tenant_not_allowed는 전용 차단 정보를 노출한다', (
+    WidgetTester tester,
+  ) async {
+    await _pumpErrorScreen(
+      tester,
+      errorCode: 'tenant_not_allowed',
+      description: '원문 메시지',
+      isProdOverride: true,
+      sessionProfileLoader: () async {
+        return {
+          'email': 'employee@example.com',
+          'tenant': {'name': 'Baron HQ', 'slug': 'baron-hq'},
+        };
+      },
+    );
+
+    final title = tr(
+      'msg.userfront.error.title',
+      fallback: '인증 과정에서 오류가 발생했습니다',
+    );
+    final detail = tr(
+      'msg.userfront.error.tenant.detail',
+      fallback: '현재 로그인된 계정은 이 애플리케이션에 접근할 수 없습니다.',
+    );
+    final account = tr(
+      'msg.userfront.error.tenant.account',
+      fallback: '계정',
+    );
+    final tenant = tr(
+      'msg.userfront.error.tenant.tenant',
+      fallback: '소속 테넌트',
+    );
+    final switchAccount = tr(
+      'ui.userfront.error.switch_account',
+      fallback: '다른 계정으로 로그인',
+    );
+
+    expect(find.text(title), findsOneWidget);
+    expect(find.text(detail), findsOneWidget);
+    expect(find.text(account), findsOneWidget);
+    expect(find.text('employee@example.com'), findsOneWidget);
+    expect(find.text(tenant), findsOneWidget);
+    expect(find.text('Baron HQ'), findsOneWidget);
+    expect(find.text(switchAccount), findsOneWidget);
+  });
 }