Multi-Factor Authentication - Office365
Multi-Factor authentication is an additional security feature enabled within Office365 Subscription with Azure.
Below are the steps to enable this feature:
1. Login to Office365 Admin Portal - Click on Setup - Multi Factor Authentication
2. Select the Users or Admins needs to be enabled with MFA
3. Click on Enable.
Post enabling users needs to logon to portal.office.com to complete the process of registering the mobile number.