Update: filed Feedback FB23869872, including a sysdiagnose captured under the Accounts/AuthKit logging profile immediately after reproducing the failure (2026-07-20, iOS 18.7.9). For anyone else hitting this: multiple other teams with App IDs/teams registered in June-July 2026 are currently reporting the identical failure (threads 834106, 837835, 837986, 749537 — FB23726069, FB23716661, FB23826495, FB23839261), while pre-2026 App IDs keep working. This is consistent with a server-side registration issue on Apple's side, the same class as the acknowledged June 2025 incident (thread 790827), which Apple resolved server-side.

We are experiencing the identical issue and have filed feedback as requested: FB23869872 Team ID: DMB7A87LM9 — Bundle ID: io.ausynclab.subio (App ID registered 2026-06-30, organization team enrolled late June 2026). Native Sign in with Apple account creation always fails with "Sign-Up Not Completed" / ASAuthorizationError 1001 with empty userInfo, for every Apple ID on every device — including Apple App Review's own devices; our app has been rejected 6+ times under Guideline 2.1(a) solely because of this. The feedback includes a sysdiagnose captured with the Accounts/AuthKit logging profile installed, taken immediately after reproducing the failure, plus the affected user's Apple ID and timestamp. Everything client-side has been verified and exhausted: capability enabled as primary (verified via ASC API), entitlement confirmed inside the signed .ipa via codesign, capability delete + re-create, fresh provisioning profile + completely new build afterwards — no change. Related reports from other teams with June-July 2026-registered App IDs: FB23726069, FB23716661, FB23826495, FB23839261 (threads 837835, 837986, 749537). Our thread: 837263.