Sometimes Subscription cancellation order may fail with the following error:
Parallels Operations Automation error #error_code #0, extype_id #173, module_id #TaskManagement, Subscription # cannot be canceled as it has related task #* in 'Running' state at this moment. Please wait until it finshed and try again.
Cancellation order is placed while the subscription being provisioned and there are still active tasks on OA side. Issue has been reported to OSA Maintenance team with internal ID PBA-77612 for future enhancements.
Resubmit the order once the tasks related to the subscription in question are completed.