Where do the targets on tasks get populated from?

Tunning EV 10.0.4 on a DAG with 4 member servers all with active databases. 

When I check the Exchange Archiving tasks for one of the members it only shows 1 database.  Where does this get populated from? Can I add the other databases manually or by adding users from exchange of these databases in the provisioning task populates this entry?

Image may be NSFW.
Clik here to view.

As you can see I should be able to see many more active databases on this particualr arching task I don't.  When I add other users to the provisioning task they don't show up as avvailable when trying to enable them for archiving.  

When I run deployment scanner it doesn't show any issues with permissions.  

Any ideas regarding this matter?

Thanks

Mike