It appears that calling a workflow template with a project sync or an inventory sync as the first step causes a failure. It appears that this is due to the plugin attempting to call the wrong URL for these types of workflow steps.
NOTE: The incorrect paths show below occur regardless of where the steps occur in the workflow. It just seems that the failure occurs when the erroneous job path doesn't already exist.
For example, for a project sync step, the plugin calls:
Similarly, with an inventory sync step, the plugin attempts to call