We are experiencing the same native “Sign Up Not Completed” failure before any credential is returned. It reproduces with two unrelated Apple Accounts on two physical iPhones. Bundle ID: com.hauville.babywise Team ID: 9ZVUZKMNPT Feedback Assistant report with Accounts/AuthKit sysdiagnose, screen recording, and reproduction timestamp: FB24011988 Could Apple please check the server-side Sign in with Apple registration/account-association state for this App ID and team?