Microsoft Authenticator
A Microsoft app for iOS and Android devices that enables authentication with two-factor verification, phone sign-in, and code generation.
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If I go to https://myaccount.microsoft.com/?ref=OfficePortalSecurityPrivacy and try and change the sign-in method, I get: We've sent a notification to your mobile device. Please open the Microsoft Authenticator app to respond. Again I don't have the Microsoft Authenticator app on my iPhone. I have downloaded it and when I try and configure, last step "Approve sign in request. We've sent a notification to your mobile device. Please open the Microsoft Authenticator app to respond"