This protocol prevents unauthorized users from logging into your account, even if your password has been compromised.
Usually, two-factor authentication for a Microsoft account requires two forms of authentication methods.
This additional method can be used in the following forms:
you might choose which method you would prefer.

The method to change your verification preference has been discussed further in this article.
You have now successfully switched on two-factor authentication.
Once configured, the app will prompt for verification on your phone.

Note that this requires two-factor authentication to be enabled from your Microsoft account as performed above.
If it is you who is logging in, choose the corresponding number and clickApprove.
If you have the Authenticator app installed, it automatically gives preferences over other two-factor authentication methods.

can communicate with your account.
Once the password has been entered, the app can communicate with your Microsoft account.
To learn how to use this password with an app, read thisMicrosoft guide.

However, some apps may now become dysfunctional with two-factor authentication enabled.
Your security information will now be removed.
Final Thoughts
Two-factor authentication helps you keep your account secure.

Anything linked to your Microsoft account will also become more secure if it is enabled.
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source: www.itechtics.com