Once we enable your organization, and your account, for multi-factor authentication (MFA) you have to set up your user account to use it. This should only take a minute or so.
By setting up MFA, you add an extra layer of security to your Microsoft 365 account sign-in. For example, you first enter your password and, when prompted, you also type a dynamically generated verification code provided by an authenticator app or sent to your phone.
If you have applications that don’t support multi-factor verification, you must set up an app password. See manage app passwords for more information.