Same issue here. Team S83WK69VDC, bundle ID com.overdrivesoftwares.zelu, Sign in with Apple capability enabled Aug 28. Sheet renders, Face ID succeeds, "Sign Up Not Completed", app receives ASAuthorizationError.canceled (1001) with empty userInfo, nothing reaches our backend. akd logs show AKSQLError -6003 / "No applications were found with the provided Client ID", and the server answers HTTP 200 with ec=-24000 "Invalid client." An older App ID on the same team (com.overdrive.agendaPro) works on the same device with the same Apple Account. Filed as FB24593873 with a sysdiagnose attached covering two reproductions. First public release blocked in review by this.