2FA TOTP backup codes not working


I am using Nextcloud 22.1.0 in a raspberry pi3 and everything works great (2FA included) except the generated backup codes. I want to make sure they work just in case my phone dies.

I’ve copied them for different users to a password manager to avoid typing errors. None of them work…

Likely this is a newbie question, sorry for that but thanks for your support.