Correct its a CCX400, the upgrade was via TAC and the firmware is currently 6.2.22.0185, device MAC is 64:16:7F:CC:5C:DB.
As previously stated within the community the CCX 400 was developed by a different team so it did initially not have the known UC Software running.
If the CCX is still on Software 1.0.0 or 1.0.1 download the latest USB UC Software 6.2.2.0185 software for CCX 400 from >here< and upgrade using a USB stick. Further below are instructions which can be followed to upgrade and configure the CCX 400 in one go.
With the 6.2.22.0185 ( and previous 6.2.21) we added this to the phone to provide additional features to it.
The previous software 1.0.0 or 1.0.1 did not support any of the above and therefore, once upgraded to 6.2.22.0185 a user will need to manually confirm:
We are aware that this may cause additional manual action and users faced by this have 2 options:
We are looking into why the phone would switch to the Skype for Business base profile instead of staying at Microsoft Teams.