Office 365 Additional Security, Require MFA to Domain Join Devices in Azure Active Directory

How to enable the feature to prompt for Multi Factor Authentication when joining a device to an Azure Active Directory domain. We would also like to limit the number of devices a user can have to 5.

Start in Azure Active Directory Admin Center

Select Azure Active Directory > Devices

Under Devices click “Device Settings”

Now you can set the max number of devices per user and enforce MFA to join devices