Microsoft authenticator is not currently supported here on QnA. Something here may help.
https://zcusa.951200.xyz/en-us/azure/active-directory/user-help/user-help-auth-app-faq
and also try asking for help in dedicated forums 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--
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Regards, Dave Patrick ....
Microsoft Certified Professional
Microsoft MVP [Windows Server] Datacenter Management
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