Following up on my earlier reply — this is now resolved for us, server-side, with no app changes. I filed FB24297924 on Aug 12 (Sign in with Apple failing for an affected Apple ID, sysdiagnose with the Accounts/AuthKit profile attached). On Aug 25 For anyone still hitting this: file the Feedback with a sysdiagnose from the affected device and note the affected Apple ID — that seems to be what gets accounts unstuck

@DTS Engineer any news about this topic?