If my origin Password is "abcd" ,then I enable 2FA and I can login in mailbox.
But I can login this forum.
How to login account with yubikey?
Compared to other major sites mailbox.org uses Pin+OTP instead of asking for a passwort first and then for the OTP in a second screen. So if your Pin is "1234" and your OTP is "567890" then you have to write 1234567890 into the password field. See also this manual:
I'm having the same problem as the OP. I created a PIN, set the OTP security level and OTP method to what is in the support link above but I still cannot login. For the password, I tried 'PIN + OTP'. I'm using YubiKey4. Any suggestions?
Thanks @jmr! It solved my login issue.
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