Entra ID includes a registration campaign feature to help organizations move users to stronger authentication methods like the Authenticator app. Running campaigns is a good thing, unless you decide to do it when the administrators are away from the office (like me) or users are unprepared. But it is time to get rid of SMS and voice responses to MFA challenges, so maybe you should schedule a campaign soon?
https://office365itpros.com/2023/09/18/registration-campaign-starts/
