As you know, end-users can access the Microsoft My Sign-Ins website (https://mysignins.microsoft.com/) to manage their security information (register MFA authentication method, set the default MFA method…).
Well, this can now also be done using the Microsoft Authenticator mobile application.
From the Authenticator application, access your account and the select Update security info
Then you are asked to sign-in and your will have access to your sign-ins, devices, security information…