Enrolling a Chromebook device follows a different process when compared to iOS or Android as there is no URL link to use or quick enroll option.
Mobile Guardian allows for the linking of GSuite accounts as well as selecting the OU's (Organisational units) which the school would like to link. The Chromebook devices are then enrolled using a sync method where Mobile Guardian syncs with the users Google (GSuite) account. There are a number of steps the user will need to do within their Google console and they have been documented for your assistance while enrolling your Chromebook devices.
There are 5 main steps that need to be completed in order to enroll Chromebook devices:
The assumption here is that the user doesn't have an existing GSuite Project created. If they do then this process is reduced to the steps to link their OU's and add credentials in order to Sync and enroll the Chromebook devices.
Although this document describes the enrolling of Chromebook devices, it also is the same process when adding users to the Mobile Guardian dashboard (and syncing them). The linking would be done with the User OU's and not just the Device OU's as described in the links above).