Thanks for reporting the issue, Christine. Upon initial troubleshooting and issue reproduction attempts, it seems that the error only occurs when the iOS app is trying to auto-reconnect the session. Meaning, users should be able to initially log in just fine. However, if they do not sign out of the app, but rather just swipe/close the app or have its session time out, then upon relaunching the application, it will try to auto-reconnect and it throws the reported error message.

We are investigating the matter, but in the meantime, suggest that users sign out before swipe/closing the app. That way when they reopen the app, they can just sign back in normally without encountering the error.

I recommend opening a support case so we can gather more information. This is the only report we've had so far about being completely unable to login, so it may be something specific to your setup that we can further troubleshoot, or it may be a bug we can address.

Edit: as Alex Huang noted below, we have identified the specific scenario where this occurs: self-hosted systems using LFDS for login, on iOS devices, when the app is trying to automatically reconnect to an existing session.