Logging into forum with 2FA leads to "UnknownError: The operation failed for an unknown transient reason"
For a while now I always get "UnknownError: The operation failed for an unknown transient reason" when I try to use my Yuikey Security Key as a second factor. I am living on backup codes right now. :) I remember transitioning to the self-hosted forum worked which is why I have now two keys registered in my user profile. The setup broke later for me.
Trying to register yet another key fails as I get asked for a PIN which I don't have.
Needless to say that the same key is working fine as an U2F means for Gitlab and our NextCloud instance using the same Tor Browser.
I got reminded here by https://forum.torproject.org/t/please-recover-my-account-2-factor-auth-broken/10434/4 although I am not sure whether the problem mentioned there is exactly the same to mine.