Your ChomeOS device requires a Chrome Enterprise Upgrade or a or Kiosk & Signage Upgrade.
Indeed, each ChromeOS device needs to be enrolled on a Google Admin conlsole in order to take advantage of the ChromeOS kiosk mode and to monitor it.
Setup ChromeOS kiosk mode from the Google Admin console
If you have your own Google domain, you will have to create a UO dedicated to digital signage players.
To do this you can follow the following documentation:
Enroll ChromeOS device
Once your domain is configured, you will need to enroll your hardware on it.
For this you can follow the documentation:
Pair your device with Comeen Play
Once the Comeen Play application has been launched on your screen, follow this documentation: