Can't enable 2fa

I tried enabling 2fa for my forum account here. But the codes my authenticator gives me results in this forum software saying “unable to enable. each code is used for once” or something similar.

Anyone else getting such an error? Let me know so that I can narrow down the cause of the error to my own authenticator software.

Most 2FA errors I had in general were because of a wrong system time, so I’d start by checking if your system time is correct.