Sign in with Apple works correctly on a physical iPhone in my Capacitor-based app, but fails in the Simulator, and this appears to be causing repeated App Store review rejections. I'm trying to figure out how to get past review....
What happens
On a physical iPhone, Sign in with Apple works as expected. In the Simulator, if the user signs into their Apple ID (Settings) and returns to the app, tapping "Sign up with Apple" fails immediately with:
The operation couldn't be completed. (com.apple.AuthenticationServices.AuthorizationError error 1000.)
(Screenshot attached.) The native Apple sheet never appears — the error returns right away.
The actual problem
Every time I submit to App Store review, the app gets rejected because Sign in with Apple fails for the reviewer — I believe they're testing in an environment (Simulator, or a device not signed into iCloud) where it returns error 1000. It works on real hardware, so I keep getting stuck in a review loop over something I can't reproduce on device.
What I've already checked
Sign In with Apple capability is present in Signing & Capabilities for both Debug and Release, and the entitlement is in the built product. The App ID has Sign In with Apple enabled in the Developer portal, and the Services ID / return URLs are configured for Clerk. Resolved an earlier iPad-specific issue where connectedScenes was empty (added a UIApplicationSceneManifest + AppDelegate.window fallback), so ASAuthorizationController now has a valid presentation anchor.
Questions
Is error 1000 (ASAuthorizationError.unknown) in the Simulator a known environment issue (e.g. no usable Apple ID for the authorization flow) rather than an app bug — given it works on physical devices? For anyone who has been rejected because Sign in with Apple failed in the reviewer's environment: what actually got you through review? Reviewer notes explaining it works on device? Replying in Resolution Center with a screen recording from a real device? Something else?
Any guidance appreciated — I'd rather fix the root cause than keep resubmitting.