I have a build that produces an nunit xml file which is processed by teamcity. Its finding it correctly and is attempting to parse it. It has the following exception:
[16:07:57]: Failed to parse C:\BuildAgent\work\a416ea07661f42a\AutomationTestResults\AutomationTestResults.xml with NUnit parser
[16:07:57]: Failed to process some NUnit reports
[16:07:57]: ##teamcity[buildStatus status='FAILURE' text='Failed to process some NUnit reports']
These tests are using Nunit NUnit-18.104.22.16822 and uses the data driven test features. I've attached some sample xml produced by nunit using a dummy/simple test project. I've also attached the complete build log, its only 64 lines.
p.s. We have an enterprise licence, if requried I can raise a support request.