Resetting Multi-factor Authentication in Office 365

by | Last updated Oct 18, 2022 | Published on Feb 1, 2019 | How-To, Office 365 / Microsoft 365

What is 2FA? (Two-factor authentication, also known as Multi-factor authentication)

It’s a simple practice the banks have been doing since the invention of a bank card and the PIN, the setup is the same as well. Two Factor is something you have (your Bank Card) and something you know (Your bank PIN). In this case for signing into web services, the something you have is a Smartphone Application like Microsoft Authenticator, Google Authenticator or another option and something you know (your password for the service your signing into).

If you need to re-enable 2FA (aka MFA) or maybe even re-set it up because of some kind of change like a new device or domain, you can use this guide to get you started.

If your Office 365 administrator has force enabled 2FA, some of these steps will automatically happen such as triggering the setup process for 2FA

  1. Sign in to the Microsoft My Sign-Ins page by visiting https://mysignins.microsoft.com/security-info
    Alternatively you can sign in to https://portal.office.com then click your profile picture (or initials) in the top-right of the page, click View account then under Security Info click Update Info
    Note:
    If you have issues signing into your account because you’ve replaced your phone and can no longer approve a sign in via an app like Microsoft Authenticator, try clicking the I can’t use my Microsoft Authenticator app right now link and see if you can use an alternate method such as a phone call or SMS. If you do not have a method available to authenticate then you will need to contact your Office 365 administrator for assistance and they can reset and request you provide new methods
  2. Once you’re signed into your account and on the Security info page, you can remove an existing method (if they no longer apply) by clicking the Delete link beside them, and you can add a new method by clicking the Add sign-in method link. You can also set the default method you’re prompted for by clicking the Change link beside where it says Default sign-in method, after setting up a method
  3. Once you’ve configured the methods you want to use, and you’ve set a default method you should see those items listed on the page – if you do then you’re safe to close that page as that means the setting has been saved for your account

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