To manage MFA verification settings such as Call phone number, Authentication app, go to this page: https://aka.ms/mfasetup or https://account.activedirectory.windowsazure.com/proofup.aspx?proofup=1
Or follow these steps:
-
Sign in to Office 365 using your password and verification code.
- Choose Settings > Office 365.
- Choose Security & Privacy > Additional security verification.
- Choose Update my phone numbers used for account security. This will display the following page:
Please view this step by step video: