Unable to perform WebAuthn 2FA on Mobile

[craftxbox]

As of a couple months ago I have been wholly unable to perform WebAuthn on my android 15 (LineageOS) device. I'm not sure when it truly started as before encountering the now fixed mobile unlock bug I had never had to reauthenticate. I press the authenticate button and nothing happens. I have tried logging in on the web vault, and it too has the same issue.

I don't think the picture-in-picture policy error is relevant, as after hiding it through nginx the issue persists.
There is absolutely no console output or error to indicate why it's failing. If I press the button a second time it will reject back to the app with the error "OperationError: A request is already pending."

[craftxbox]

Ah.. After trying the webauthn.io test it's also happening there. This is probably not a vaultwarden issue, but I'll leave this open until i know for certain.

[craftxbox]

This turned out, ironically enough, to be the fault of the Bitwarden app itself being the only enabled auto fill provider. If you are not logged into the app, it will fault out and not attempt to bring up the system ui.
Enabling Google as a secondary provider fixes it, as when the Bitwarden app faults out the Google manager steps in, and is smart enough to then fall back to the system ui.

[Jordanb716]

I had a similar issue. This didn't fix it, but switching my default browser to Firefox did. Just wanted to throw this out there for anyone else running into this problem.