Trading Networks - Delivery Batch not draining Queue

WebMethods 10.3 - Trading Networks

This is a production issue. We have a Trading Partner where the delivery methods is queue for polling using the built in EDI Batch process. I’ve confirmed that the documents are processed and queued for delivery. When I manually execute the service “wm.tn.queuing:listQueuedTasks” there are pending tasks in the list.

However, when I manually execute the service “wm.tn.queuing:deliverBatch” with the queue name, the documents are not dequeued and processed further for delivery.

Any ideas why this would happen?

I thought this is supposed to cause the IS to grab all queue tasks and batch them into a single X12 envelope for further processing.