A Microsoft app for iOS and Android devices that enables authentication with two-factor verification, phone sign-in, and code generation
if you are admin go to microsoft entra admin center. search for the user and click to enter their profile. look for the MFA status box under my feed. click on the manage mfa authentication methods link. you will see all their usable authentication methods. i have deleted the phones at that point and then had them resync by signing into office.com to get the qr code. then had them add the account in authenticator again using that qr code.