Adding another affected team to this thread. Team ID: 6W53S3F2XM Bundle ID: ph.richtek.adamm App: ADAMM (HRIS ESS mobile app) Sign In with Apple capability is enabled and confirmed "Enable as a primary App ID" (non-wildcard). Entitlement verified present in the actual signed/uploaded TestFlight binary (com.apple.developer.applesignin = ["Default"]). Every attempt fails with "Sign Up Not Completed" after Face ID/password confirmation succeeds — reproduced on two physical devices and two different Apple IDs, both with 2FA enabled, neither Apple ID shows any existing entry under "Apps Using Apple ID" for this app. Google Sign-In and password login both work normally on the same builds, so this is isolated to Sign in with Apple specifically. Would appreciate the same server-side team registration check that resolved this for the teams above. Happy to provide sysdiagnose/ptxid if needed.