Hi, only helpful information I found on active queue is this help article: https://help.blueprism.com/1137152792
According to the description i guess the Active Queue will not automatically start consuming the item and processing it on the next available ressource, instead you have to trigger the execution by creating a session manually:
For a Work Queue, a Session must be created against a Resource, Resource Group or Resource Pool. The selected Resource(s) would then work that Work Queue until all Items have been worked.
Please let us know if this helped, else maybe there will be additional answers and comments.
Regards
Alex