Try using the Open Get Help app here, and you'll eventually get to chat with microsoft account support.
https://support.microsoft.com/en-us/contactus/
The microsoft authenticator app is not supported here on QnA. They're actively answering questions dedicated forum here.
https://social.technet.microsoft.com/Forums/en-US/home?forum=MicrosoftAuthenticatorApp
--please don't forget to Accept as answer if the reply is helpful--
Regards, Dave Patrick ....
Microsoft Certified Professional
Microsoft MVP [Windows Server] Datacenter Management
Disclaimer: This posting is provided "AS IS" with no warranties or guarantees, and confers no rights.