BP Sky Sphere & Sky Light ?

I took apart the BP Sky Sphere, the object & material, using them without the BP. Adding a Sky Light to the scene only seems to work with the BP. I can’t find any reason (option / setting) why it won’t work with just the mesh ?

I lowered the “sky distance threshold”, I can only guess it’s done via the parent bp.

I had this problem as well, try adding atmospheric or exponential height fog.