How to Reconfigure Multi-Factor Authentication Settings
If you have not completed Multi-Factor Authentication (MFA) configuration for the first time, please see the Decisions Prior to Multi-Factor Authentication Setup article. You can only reconfigure your MFA settings if you have already set them up on your account.
If you decided to use the Microsoft Authenticator app as one of your authentication verification methods, please install the app on your mobile device prior to starting this process. The Microsoft Authenticator App is available for iOS and Android.
MFA configuration should be done from a laptop or desktop. Configuring the Microsoft Authenticator App requires scanning a QR code displayed on screen. You will not be able to scan the QR code if you are configuring MFA on the same device that has the Microsoft Authenticator App installed.