Ensure Microsoft Calling Plan is Removed
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 Enterprises 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."
Here is a step by step process to ensure that it is disabled.
Solution
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Ensure that you have assigned per Group A a User and Add On License to any Users who will have the Connector activated. Navigate to Users>Active users>(future Teammate Connector User)
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After selecting the User Navigate to Licenses and Apps
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Select App, then Dropdown Menu will appear
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Ensure that the Calling Plan is unselected
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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.