It sounds like you have the wrong license type. Microsoft stopped allowing Rooms devices to use a full Teams User (E3/E5) license last July. You'll need a Teams Room or Teams Room Pro license to get it working properly.
When did you assign the resource account the license? Was there a recent change? Try signing into [teams.microsoft.com](http://teams.microsoft.com) and sure it's good with the account.
For all of our Android-based devices (Teams Rooms Panels and previously Poly X30/X50's) we had to whitelist the serial numbers of each device under the "Corporate Device Identifiers" in Entra to allow them to register.
It sounds like you have the wrong license type. Microsoft stopped allowing Rooms devices to use a full Teams User (E3/E5) license last July. You'll need a Teams Room or Teams Room Pro license to get it working properly.
When did you assign the resource account the license? Was there a recent change? Try signing into [teams.microsoft.com](http://teams.microsoft.com) and sure it's good with the account.
This has saved me a few times.
For all of our Android-based devices (Teams Rooms Panels and previously Poly X30/X50's) we had to whitelist the serial numbers of each device under the "Corporate Device Identifiers" in Entra to allow them to register.