Any chance you can post a screenshot of this screen? From what I can tell, your account is in an unusual state. It feels like one part of the app has a record of the 2FA key, but not the other part. A bit hard to explain, but on the Discourse side there are two concepts: security keys and second factor methods (one of which is security keys, the others are TOTP and backup codes).
IIRC, yes, there was a short window where the UI for backup codes was not encouraging enough to users, in other words, I believe for a short period of time, the backup code generation was somewhat hidden.