diff --git a/backend/internal/handler/auth_handler_async_test.go b/backend/internal/handler/auth_handler_async_test.go
index 5ba21713..24d9223e 100644
--- a/backend/internal/handler/auth_handler_async_test.go
+++ b/backend/internal/handler/auth_handler_async_test.go
@@ -114,10 +114,20 @@ func (m *AsyncMockUserRepo) CountByTenant(ctx context.Context, tenantID string)
 	return 0, nil
 }
 
+func (m *AsyncMockUserRepo) FindByTenantIDs(ctx context.Context, tenantIDs []string) ([]domain.User, error) {
+	args := m.Called(ctx, tenantIDs)
+	return args.Get(0).([]domain.User), args.Error(1)
+}
+
 func (m *AsyncMockUserRepo) CountByTenantIDs(ctx context.Context, tenantIDs []string) (map[string]int64, error) {
 	return nil, nil
 }
 
+func (m *AsyncMockUserRepo) FindByCompanyCodes(ctx context.Context, codes []string) ([]domain.User, error) {
+	args := m.Called(ctx, codes)
+	return args.Get(0).([]domain.User), args.Error(1)
+}
+
 func (m *AsyncMockUserRepo) CountByCompanyCodes(ctx context.Context, codes []string) (map[string]int64, error) {
 	return nil, nil
 }
diff --git a/backend/internal/handler/tenant_handler_test.go b/backend/internal/handler/tenant_handler_test.go
index e5c346bf..1372cda0 100644
--- a/backend/internal/handler/tenant_handler_test.go
+++ b/backend/internal/handler/tenant_handler_test.go
@@ -127,10 +127,20 @@ func (m *MockUserRepoForHandler) CountByTenant(ctx context.Context, tenantID str
 	return 0, nil
 }
 
+func (m *MockUserRepoForHandler) FindByTenantIDs(ctx context.Context, tenantIDs []string) ([]domain.User, error) {
+	args := m.Called(ctx, tenantIDs)
+	return args.Get(0).([]domain.User), args.Error(1)
+}
+
 func (m *MockUserRepoForHandler) CountByTenantIDs(ctx context.Context, tenantIDs []string) (map[string]int64, error) {
 	return nil, nil
 }
 
+func (m *MockUserRepoForHandler) FindByCompanyCodes(ctx context.Context, codes []string) ([]domain.User, error) {
+	args := m.Called(ctx, codes)
+	return args.Get(0).([]domain.User), args.Error(1)
+}
+
 func (m *MockUserRepoForHandler) CountByCompanyCodes(ctx context.Context, codes []string) (map[string]int64, error) {
 	args := m.Called(ctx, codes)
 	if args.Get(0) == nil {
diff --git a/backend/internal/service/tenant_service_test.go b/backend/internal/service/tenant_service_test.go
index 21901e8f..1f207ec1 100644
--- a/backend/internal/service/tenant_service_test.go
+++ b/backend/internal/service/tenant_service_test.go
@@ -143,6 +143,11 @@ func (m *MockUserRepoForTenant) CountByTenant(ctx context.Context, tenantID stri
 	return int64(args.Int(0)), args.Error(1)
 }
 
+func (m *MockUserRepoForTenant) FindByTenantIDs(ctx context.Context, tenantIDs []string) ([]domain.User, error) {
+	args := m.Called(ctx, tenantIDs)
+	return args.Get(0).([]domain.User), args.Error(1)
+}
+
 func (m *MockUserRepoForTenant) CountByTenantIDs(ctx context.Context, tenantIDs []string) (map[string]int64, error) {
 	args := m.Called(tenantIDs)
 	if args.Get(0) == nil {
@@ -151,6 +156,11 @@ func (m *MockUserRepoForTenant) CountByTenantIDs(ctx context.Context, tenantIDs
 	return args.Get(0).(map[string]int64), args.Error(1)
 }
 
+func (m *MockUserRepoForTenant) FindByCompanyCodes(ctx context.Context, codes []string) ([]domain.User, error) {
+	args := m.Called(ctx, codes)
+	return args.Get(0).([]domain.User), args.Error(1)
+}
+
 func (m *MockUserRepoForTenant) CountByCompanyCodes(ctx context.Context, codes []string) (map[string]int64, error) {
 	args := m.Called(ctx, codes)
 	if args.Get(0) == nil {
diff --git a/backend/internal/service/user_group_service_test.go b/backend/internal/service/user_group_service_test.go
index f774fe7d..209b58d9 100644
--- a/backend/internal/service/user_group_service_test.go
+++ b/backend/internal/service/user_group_service_test.go
@@ -86,6 +86,11 @@ func (m *MockUserRepository) CountByTenant(ctx context.Context, tenantID string)
 	return int64(args.Int(0)), args.Error(1)
 }
 
+func (m *MockUserRepository) FindByTenantIDs(ctx context.Context, tenantIDs []string) ([]domain.User, error) {
+	args := m.Called(ctx, tenantIDs)
+	return args.Get(0).([]domain.User), args.Error(1)
+}
+
 func (m *MockUserRepository) CountByTenantIDs(ctx context.Context, tenantIDs []string) (map[string]int64, error) {
 	args := m.Called(tenantIDs)
 	if args.Get(0) == nil {
@@ -94,6 +99,11 @@ func (m *MockUserRepository) CountByTenantIDs(ctx context.Context, tenantIDs []s
 	return args.Get(0).(map[string]int64), args.Error(1)
 }
 
+func (m *MockUserRepository) FindByCompanyCodes(ctx context.Context, codes []string) ([]domain.User, error) {
+	args := m.Called(ctx, codes)
+	return args.Get(0).([]domain.User), args.Error(1)
+}
+
 func (m *MockUserRepository) CountByCompanyCodes(ctx context.Context, codes []string) (map[string]int64, error) {
 	args := m.Called(ctx, codes)
 	if args.Get(0) == nil {