My team is also experiencing this issue. Submitted a support ticket with case ID 102371908508. We integrated passkeys recently and are also seeing ~5% of users encountering this failure reason. I'm able to recreate occasionally by deleting the app, reinstalling, and then quickly attempting to log in with a passkey. @Apple Designer Is this issue still being worked on? It is present even in the latest iOS 18 betas.

I have: FB14714997 I also created a PR on the swift-foundation GitHub repo: https://github.com/apple/swift-foundation/pull/834

Thanks! That's very helpful.