Transcript
A wafrn woot (post) by @[email protected] 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.
For work apps, you can “contact an admin” if you can’t access TOTP. Some other services also have account recovery options if you lose that access.
In other cases, I think you are screwed because you opted into requiring a second factor then lost it.