Hi there. New Nitrokey Pro user here, trying to get going by enabling Two Factor Authentication for this very forum.
I work under Funtoo-Linux, got the Nitrokey App running (see: https://i.imgur.com/8Go0yzr.png) and follow the two-factor-generic tutorial.
I use the provided secret key, create a “slot” with it in the app, use Menu > Passwords > and the respective entry, use the OTP in the
Code field and get the following error:
Invalid authentication code. Each code can only be used once.
This happens also with my Nextcloud account over at cloud01.opsdata.ch. What can I do further?