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?

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