The Devices page offers many options to manage devices, including the Install MDM (+MDM) button:
When clicked, this button checks if there is an active MDM configuration on the device.
- If there is a connection, it uses Apple's MDM service to reinstall itself.
- If there is not a connection, it will try to use the macOS command profiles install to reinstall MDM. On macOS Mojave through Catalina, MDM will need to be re-approved after this command is sent. Approvals can be done by standard users and admin users.
Note: the profiles command has been deprecated on Big Sur+. However, devices on the newer OS versions can still benefit from using this button, as it remediates the issue of profiles appearing as unverified after the SSL certificate expires.