How to: Add a secondary/alternative phone number after setting up Microsoft multifactor authentication (MFA)


If you want to add a secondary or alternative phone number for Microsoft multifactor authentication (MFA), please follow the directions below.


1) Sign in to

2) In the left-hand menu, click Security info.

3) Click Add sign-in method.

4) In the drop-down menu, choose Alternate phone.

5) Click Add.


The alternative phone number has been saved to your TTU Microsoft 365 account. You can use it when signing in to services that require MFA.