Unable to process SessionCreator.exe Output in TestExecute via TeamCity

If TC is returning Exit Code 0, then it thinks it's done and no errors occurred.

https://support.smartbear.com/testcomplete/docs/working-with/automating/command-line-and-exit-codes/exit-codes.html

To troubleshoot this, I would do three things:

1. Run the project on its own in TestComplete and make sure it works.
2. Run the project on its own in TestExecute without TeamCity and make sure it works.
3. Run the project in TestExecute with TeamCity and no parallel plans and make sure it works.

Let us know these results and we can try to help further.