Might be interpreting your comment wrong, but it is compatible with competitors. You don’t need to use Authenticator as your 2FA for a personal Microsoft account, and you can use Authenticator in place of any other TOTP app. It’s OP’s IT department that have chosen to disable the option to use other apps.
I can look at the earliest posts and comments on my account from 10 years ago and cringe at my past self. I’ll definitely be able to do the same with this account in the future haha