I'm experiencing an issue with Sign In with Apple integration in my React Native Expo app (Bundle ID: com.anonymous.TuZjemyApp).
Problem Description:
When users attempt to sign in using Sign In with Apple, they successfully complete Face ID/password authentication, but then receive a "Sign-Up not completed" error message. The authentication flow appears to stop at this point and doesn't return the identity token to my app.
Technical Details:
Frontend Implementation:
Using expo-apple-authentication.
Requesting scopes: FULL_NAME and EMAIL
App is properly configured in app.json with:
usesAppleSignIn: true
Entitlement: com.apple.developer.applesignin
Backend Implementation:
Endpoint: POST /api/auth/apple
Using apple-signin-auth package for token verification
Verifying tokens with audience: com.anonymous.TuZjemyApp
Backend creates/updates user accounts based on Apple ID
Question:
I'm not sure why the authentication flow stops with "Sign-Up not completed" after successful Face ID verification. The identity token never reaches my app. Could you please help me understand:
What might cause this specific error message?
Are there any additional Apple Developer Portal configurations required?
Could this be related to app capabilities or entitlements?
Is there a specific setup needed for the app to properly receive identity tokens?
I set up provisioning profiles, and added Sign in with Apple as a capability and still it doesn't work.
