Flutter Apple Sign In Error 1000: The Fix No One Talks About

I'm building an iOS reading app solo. The idea is simple — save sentences that stop you while reading, turn them into beautiful cards, and share them. The stack is Flutter, Express/TypeScript, and Supabase. Authentication is handled with Apple Sign In. Apple requires apps to support account deletion, or they'll reject your app during review. So I built it. And with Apple Sign In, deleting an account isn't just about wiping the user from your database. You have to revoke the Apple refresh_token too. That's how Apple officially disconnects the user from your app. I got it working. Revoke call on the server, soft delete in the database. Everything looked fine. Then It Broke After testing account deletion, I tried signing in again. The moment I tapped the login button, it crashed. No Apple authentication sheet. Nothing. Just an error. SignInWithAppleAuthorizationException( AuthorizationErrorCode.unknown, The operation couldn't be completed. (com.apple.AuthenticationServices.AuthorizationEr