Nothop
Your situation sounds beyond frustrating. I’m making the assumptions that you’ve enrolled the Yealink panels using the same accounts that you are attempting to use for the Crestron panels, and that both panel models are running the same Microsoft Teams Room software.
Perhaps ask your admins if they have any conditional access or Intune enrolment policy restrictions (e.g. Make/Model/OS) that might be affecting the Crestron devices specifically.
Also ask them to review sign in logs for the device accounts to check for any clues.
Lastly, you could ask your network team to trace traffic to see if anything the Crestron’s are attempting to access (e.g. NTP endpoint) is getting blocked - but that is a long shot given the Yealink’s work and shouldn’t be doing anything different.
Have you tried a Crestron panel on a different network, like taking it home to test with?
Is the error message “cannot be enrolled to Intune” exactly what you see?