diff --git a/e2e/src/specs/server/api/oauth.e2e-spec.ts b/e2e/src/specs/server/api/oauth.e2e-spec.ts
index 157fdfc84c..8851356c9e 100644
--- a/e2e/src/specs/server/api/oauth.e2e-spec.ts
+++ b/e2e/src/specs/server/api/oauth.e2e-spec.ts
@@ -351,7 +351,7 @@ describe(`/oauth`, () => {
         const callbackParams = await loginWithOAuth('oauth-no-auto-register');
         const { status, body } = await request(app).post('/oauth/callback').send(callbackParams);
         expect(status).toBe(400);
-        expect(body).toEqual(errorDto.badRequest('User does not exist and auto registering is disabled.'));
+        expect(body).toEqual(errorDto.badRequest('OAuth authentication failed'));
       });
 
       it('should link to an existing user by email', async () => {
diff --git a/server/src/services/auth.service.ts b/server/src/services/auth.service.ts
index 82c2b3fb48..bae085745a 100644
--- a/server/src/services/auth.service.ts
+++ b/server/src/services/auth.service.ts
@@ -322,7 +322,7 @@ export class AuthService extends BaseService {
       const emailUser = await this.userRepository.getByEmail(normalizedEmail);
       if (emailUser) {
         if (emailUser.oauthId) {
-          throw new BadRequestException('User already exists, but is linked to another account.');
+          throw new BadRequestException('OAuth authentication failed');
         }
         user = await this.userRepository.update(emailUser.id, { oauthId: profile.sub });
       }
@@ -334,7 +334,7 @@ export class AuthService extends BaseService {
         this.logger.warn(
           `Unable to register ${profile.sub}/${normalizedEmail || '(no email)'}. To enable set OAuth Auto Register to true in admin settings.`,
         );
-        throw new BadRequestException(`User does not exist and auto registering is disabled.`);
+        throw new BadRequestException('OAuth authentication failed');
       }
 
       if (!normalizedEmail) {