If you're exporting it the right way blender will tell you that you exported 2 objects, so prop points are counted there. Other than that, no idea, sry. Maybe you'll find something in here: https://wildfiregames.com/forum/topic/19739-prop-points-guide-and-faq/
There is already a point that is a child of the armature (the source object) called prop-weapon_R. Just in case I made a new empty and parented it to the right hand, yet still no luck...
The strange part is that the backpack works, but not the carrying basket. When the unit gathers a resource, the axe/pickaxe/whatever does not work but the whicker basket on their back does. Also, it does not show them carrying anything to their side but their arms are clearly doing so...