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A wafrn woot (post) by @tinker@infosec.exchange saying "Microsoft Authenticator needs me to validate with Authenticator in order to log in with Authenticator to use it to authenticate another app with Authenticator. Here is the app telling me to open itself to validate itself with itself. #infosec #iHateComputers" It has a screenshot showing the microsoft authenticator app.
Pretty sure you have another device registered with Authenticator here, and it is asking you to verify against that.
It would be bad if somebody could just steal your username/password and then register their own MFA, right?
This happens when your Microsoft account password is externally managed by your employer. If the password is changed externally, then authenticator needs to re-authenticate… with itself.