When you set it, the web service or app requires an additional six or eight-digit code to confirm your identity. Open Authenticator, tap a code to copy it, and enter the code.

This usually generates a QR code, which you can then scan using the Microsoft Authenticator app. Now that you have your accounts set up, you'll be prompted to enter a six-digit code the next time ...

Microsoft is not shutting down the Authenticator app. The six-digit codes generated by the Authenticator to support services ...

Microsoft is urging organizations using the Microsoft Authenticator app to activate additional security functionality to protect against possible 'multifactor authentication fatigue attacks ...