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We couldn't find a user's successful login using multi-factor authentication. Make sure you successfully log in at least once and that you are prompted for a second form of authentication

Secure Your Users' Identity
We couldn't find a user's successful login using multi-factor authentication. Make sure you successfully log in at least once and that you are prompted for a second form of authentication.

Reset your password once you have enabled your authentication for your user name and you will be prompted to authenticate your device once more.

https://trailhead.salesforce.com/ja/trailblazer-community/feed/0D54S00000HDKH3

Secure Your Users’ Identity

Had same issue and did this badge just with another org, and it worked. I assume it's because i messed up my domain before, when I cchanged url for my org