Same issue here. Team ID K322BCXN7N, bundle ID com.vmatusevic.ListReel, App ID registered 2026-09-01 with Sign in with Apple enabled as a primary App ID. The sheet renders, authentication succeeds, then "Sign-Up Not Completed"; the app gets no callback. Reproduced in a development build on 2026-09-02 and in a TestFlight build under an App Store profile on 2026-09-09. Feedback filed: FB24708261. Could someone please re-provision the team's Sign in with Apple registration?