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Once you have gone through the setup process it can be updated by going to your security info settings in Microsoft https://mysignins.microsoft.com/security-info..Please note that it MFA is mandatory once you are signed in and you will be locked out of your account if you were to remove all MFA from your account following signup. The process will ‘lead you' towards apps that work for this process. I recommend the ‘Microsoft Authenticator App'. There are other apps that can be used instead if that is your preference thoughWiping your device or getting a new device are often times that you will need to update/add methods. Before wiping/changing devices please ensure you have a method of authentication that will work after you have wiped/replaced the device. Please note that MFA does NOT restore via a backup. The app will restore, its configuration will not. Setting MFA up on an alternate device, or using SMS/text temporarily are methods that can assure your ability to sign in following and set up the device appropriately. Please note that although SMS/text ‘works’ it is relatively easily hackable and is not really recommended as a method of MFA for regular use on your account.
A good way to test if the MFA setup process worked, and to practice working with it if you are unfamiliar with it, is to open a ‘new incognito window' in Chrome, and then try to signing in to https://mail.google.com/ and to your https://www.office.com/ account (Onedrive).
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