Problem
If you are using Microsoft’s Calling Plan license, you will need to remove it before adding a Direct Route to your PBX. Microsoft has a trial license that includes Calling Plan so it is a common way for Enterprises to first test out the service.
If this license is present, you will receive an error that says "Cannot modify the parameter: "OnPremLineURI" because it is restricted for the user service plan: MCOProfessional,MCOMEETADD,MCOEV,MCOPSTN1."
The “D” icon in the License Details column indicates this situation.
Here is a step by step process to ensure that the license gets disabled.
Solution
Ensure that you assign a License to any Users who will have the Connector activated.
Navigate to Users>Active users>(future ConnecttoTeams Connector User)After selecting the user, navigate to Licenses and Apps.
Select App, then Dropdown Menu will appear.
Ensure that the Calling Plan is unselected.
Save changes when ready.
Once Microsoft Admin confirms those licensing changes have occurred for the user, you will be able to link Teams to the PBX using the Connector.