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.
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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).png?sv=2022-11-02&spr=https&st=2025-12-01T23%3A12%3A33Z&se=2025-12-01T23%3A23%3A33Z&sr=c&sp=r&sig=f3DwLLwAZWPfuWwQlGCvURhtX5WBxL1OhL7pRSnsD6c%3D)
After selecting the user, navigate to Licenses and Apps.
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Select App, then Dropdown Menu will appear.
Ensure that the Calling Plan is unselected.
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Save changes when ready.
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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.