Same issue for our team. Team ID R38MU4M743, bundle ID com.happeninlabs.there, App ID created August 2026. Native sheet shows "Sign Up Not Completed", ASAuthorizationError.canceled (1001) with empty userInfo, no credential issued. Entitlement, PRIMARY_APP_CONSENT capability, explicit profile, and agreements all verified; same Apple ID works with Sign in with Apple in other apps on the same device. Filed FB[your new FB number] with sysdiagnose (Accounts profile installed) captured during a failing attempt. Could you apply the same server-side fix that resolved GW7XA5CX69 and FRL3DTJQ62?