To enable or disable Office 365 Multi-Factor Authentication (MFA) is just turning Security default on or off. You will do that on Azure portal. This article shows you how to do so.
1. Sign into the Microsoft 365 admin center with global admin credentials.
2. In the left pane choose Show All and under Admin centers, choose Azure Active Directory.
3. It redirect you to Azure Active Directory admin center. Alternatively, you just login Azure portal. Now, click on Azure Active Directory.
4. In In the Azure Active Directory admin center choose Azure Active Directory > Properties.
5. At the bottom of the page, choose Manage Security defaults.
6. Choose Yes to enable security defaults or No to disable security defaults, and then choose Save.
Note: If you have been using baseline Conditional Access policies, you will be prompted to turn them off before you move to using security defaults.
please view the step by step video:
