Same issue, same signature, another data point. Team 73QR7KF5X4, bundle com.makeitsync.app (App ID D9YKJ6CHVZ). The native sheet renders, Face ID completes, then "Sign-Up Not Completed"; the app receives ASAuthorizationError 1000/1001 with empty userInfo. Entitlement verified inside the signed binary; capability enabled with primary app consent; agreements accepted; capability off/on toggle changed nothing. A first-time Sign in with Apple sign-up in an unrelated App Store app succeeds on the same device and Apple Account during the failure window. Also reproduced by App Review (2.1(a) rejection). Filed as FB24157819 with sysdiagnose captured immediately after a failed attempt. Could you please check the server-side Sign in with Apple registration for this team as well?