diff --git a/server/route/api/v1/auth_service.go b/server/route/api/v1/auth_service.go
index ca01343..a574286 100644
--- a/server/route/api/v1/auth_service.go
+++ b/server/route/api/v1/auth_service.go
@@ -143,9 +143,15 @@ func (s *APIV1Service) SignInWithSSO(ctx context.Context, request *v1pb.SignInWi
 }
 
 func (s *APIV1Service) SignUp(ctx context.Context, request *v1pb.SignUpRequest) (*v1pb.User, error) {
-	if !s.Profile.Public {
+	workspaceSecuritySetting, err := s.Store.GetWorkspaceSecuritySetting(ctx)
+	if err != nil {
+		return nil, status.Errorf(codes.Internal, fmt.Sprintf("failed to get workspace security setting, err: %s", err))
+	}
+	if workspaceSecuritySetting.DisallowUserRegistration {
 		return nil, status.Errorf(codes.PermissionDenied, "sign up is not allowed")
 	}
+
+	// Check if the number of users has reached the maximum.
 	if err := s.checkSeatAvailability(ctx); err != nil {
 		return nil, err
 	}