When does the error occur?
The error occurs when you are trying to assign a TestComplete test case associated with an Azure team project’s test case to another test case, and TestComplete fails to change the association.
Why is the message shown?
The message is shown because TestComplete fails to add a new association to a test case.
To learn more about associating your TestComplete test cases with Azure DevOps test cases, see Integration With Azure DevOps and Team Foundation Server via TestComplete Test Adapter.