The headline is *extremely* unfortunate, since it could confuse users into avoiding #MFA mechanisms that @Alex_T_Weinert is actually advocating for, like push-based authn and authenticator apps, not to mention #FIDO, that rely on "phones".
https://www.zdnet.com/article/microsoft-urges-users-to-stop-using-phone-based-multi-factor-authentication/
https://www.zdnet.com/article/microsoft-urges-users-to-stop-using-phone-based-multi-factor-authentication/