Check to see what device type the MX300 was added to CUCM as. You can see this error pop up if you add a device to CUCM with the wrong device type than what is actually trying to register. Make sure the device type is set to CTS-MX300-G2 and not CTS-MX300.
I've upgraded the MX300G2 to TC7.1.1 but it still gives the same error.
Í've installed cmterm-devicepack126.96.36.19917-2.cop.sgn and rebooted the cluster but still no other device than Cisco TelePresence MX300. I can't install devicepack188.8.131.5233-1 because it's specific for UCM 9.1.2 release and we're running UCM 9.1.1
The MX300-G2 has a separate Device Profile than the MX300:
When adding one, it will show as
Product Type: Cisco TelePresence MX300 G2
Also see the following From one of the Device Package release notes:
Note: When you apply a Device Package to enable new device support, a cluster-wide reboot is required for those devices to register successfully. A cluster-wide reboot is not required when you apply a Device Package to update existing firmware/configuration.
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