Microsoft Authenticator works in a similar way to other apps, such as Google Authenticator.
The generated codes are valid even if there is no Internet connection, since both the app and the website you want to access use the same algorithm to generate codes randomly. With two-factor authentication, you can block this, as they cannot access your account without entering the code generated by the app. If you make the mistake of reusing passwords and one of them is stolen through data mining, the thieves can use this information to access other services. Two-factor authentication is extremely important and helps prevent your account from being hacked.
Microsoft Authenticator is the official Microsoft app for two-factor authentication (2FA) on thousands of websites and services.
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