How to change your phone number in Multi-Factor Authentication (MFA)

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If you have changed your phone number or wish to change the phone number where your authentication text/call is received, here's how.

Remember, if you are using phone as your method of authentication then it has to be a device that only you use, and not a team phone

Also - it's quicker and easier to use the Authenticator app. If you can use that, then follow the guide here: How to use the Authenticator app for Multi Factor Authentication.

To change your phone number

Step 1. On your work computer go to My Sign-Ins | Security Info | Microsoft.com

If you already have a phone number here it will show on this page, you will see the number listed. Click on Change

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Enter in your new number, and click save. This will update your phone number listed. 

Step 2? There is no step 2!

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