Hello, Swindian
Welcome to Microsoft Community.
As you can see in this topic: How to recover Microsoft authenticator - Microsoft Q&A, you must make sure you don't have a personal Microsoft account already set up in the authenticator app. Otherwise, Microsoft Authenticator may overwrite or erase an existing account by mistake. And if you haven’t backed up your account credentials, it may not be possible to recover them.
By the way, issues related to Microsoft Authenticator may be beyond the scope of issues that Microsoft Community can address. Microsoft Learn, on the other hand, aims to support more advanced issues like Microsoft Authenticator and is the best resource for further assistance. You can share specific scenarios and ideas to help resolve the problem at Microsoft Authenticator - Microsoft Q&A. But I will keep the thread open in Microsoft Community, as one of our volunteers may have additional insights that could be helpful to you.
I understand this may not be the outcome you expect, but let me know if you have any other concerns.
Let me know if you have any other concerns.
Best regards
Yuhao Li
Microsoft Community Technical Support