3d max Populate People lighting

I have imported some 3d Max populate animated people into Unreal and have got my animation working well.

Its an interior with lots of openings. its lit by a few static lights and the sun set to movable, all of which is baked by lightmass.

Anyone have any ideas if this is the best approach to generate shadows to my moving people? They seem to be lacking a bit,
but may be down to the fact the sun isn’t hitting them direct.