Android/iOS: Microsoft has had separate two-factor authenticator apps for its consumer and enterprise users for a while. Now, it's combining the two into the new Microsoft Authenticator and adding a few new features while they're at it.
The new combined app will feature one-button approval, one of the more convenient and safe ways to secure your account. If your device has a fingerprint sensor, you can also use that to approve an authentication request. The app is rolling out for consumers as an update to the Azure Authenticator packages below.
Microsoft Authenticator [iTunes App Store]