Records not going through to Queue

I have taken over an existing CRM infrastructure which includes Scribe. We have a Queue job in place that works in Production, but the UAT system is not passing any records through. I'm a little rusty with my scribe. Where am I best looking to diagnose why there are no records going through. When I test the job there is a single record, which I assume is from a test xml file. I can see in scribepublisherqueue in CRM that the plugins are assumingly working as data is being entered in the table. What makes it go from there, into the Scribe queue and ultimately into our target system?

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