This article explains why the native iOS sign-in process with an Apple ID fails after an initial successful login. The subsequent sign-in attempt results in the following error:

Sign-up not completed

This article discusses the cause of this issue and provides resolution steps.

• Apple Social Login
• iOS

The error occurs because of a configuration mismatch between the settings in Apple and the Auth0 connection.

To resolve this issue, verify the connection settings between Apple and Auth0.

1. Verify that the Client ID and Client Secret saved in the Auth0 connection match the credentials provided by Apple.

2. Confirm that the Callback URL and domain are correctly configured on the Apple developer portal.

   • NOTE: If a Custom Domain is used in production, ensure it is registered in the Apple configuration. A mismatch can occur if the configuration still points to the default Auth0 domain used during development.

3. Ensure the Apple connection is enabled for the correct Auth0 Application.

   1. In the Auth0 dashboard, go to Authentication > Social.

   2. Select Apple.

   3. Select the Connections tab.

   4. Enable the connection for the application tied to the iOS app.