Message - Unable to send the results of the "Function" test to an external test management system.
Let me quote the Support Team for anyone experiencing the same issue:
This is a known issue with 14.74. This version erroneously stores the linked Case ID in the tmsData attribute of linked Test Items (see your project's .mds file). Clear this attribute so the tests run normally again (tmsData="").
Note that it does not affect the linking feature as in this case, Azure itself stores the linking data, and TestComplete is supposed to just pull it via Azure API.
Please contact Support for a patch to help overcome this!