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Sophos Chromebook Security can be deployed using Sophos Central or Google G Suite. This is an overview of the steps involved. For further information about Sophos Chromebook Security please the Sophos Mobile admin guide at docs.sophos.com
Deployment via Sophos Central
Deployment via G Suite
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Yes, the Chromebook Security feature requires the Mobile Advanced or Intercept X for Mobile license. Therefore it will consume one of these licenses.
Following this Article, question of mine is after the chromebook appears in device list, it looks like it's using the Mobile Advanced license. Is this always true? For example, I was aiming to get the chromebook to use Mobile standard license but haven't been able to find an option that differentiates these two licenses mentioned in the License Matrix.