The official Microsoft app for two-factor authentication (2FA) for tens of thousands of websites and services is called Microsoft Authenticator. It’s crucial to use two-factor authentication since it guards against account hacking.
Reusing passwords puts you at risk of having one stolen through data mining, where hackers can use it to log into other services. You can prevent this with two-factor authentication since they need to enter the code the app generates in order to access your account. As both the app and the website you want to access use the same process to create codes randomly, they are still valid even if there is no Internet connection.
Similar to other apps like Google Authenticator, Microsoft Authenticator operates in a similar manner. You must scan the generated QR code after enabling 2FA for a particular service. The app will then be connected to the service after that.
You will now need to open the app and copy the code displayed each time you sign in to this service. This code is only valid for 30 seconds before being replaced by another.
Hence, download the Microsoft Authenticator APK right away if you want the best security for your device.