- **Require Multi-Factor Auth to join devices** - You can choose whether users are required to provide an additional authentication factor to join their device to Azure AD. The default is **No**. We recommend requiring multi-factor authentication when registering a device. Before you enable multi-factor authentication for this service, you must ensure that multi-factor authentication is configured for the users that register their devices. For more information on different Azure multi-factor authentication services, see [getting started with Azure multi-factor authentication](../authentication/concept-mfa-whichversion.md).
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