Whenever I import scene from data smith then default lighting works in the port. But whenever I try to build light using skylight and sunlight then the t is not baked. And I face this issue in all projects that I did in 4.23
Just make sure that this sphere you have outside with the hdri picture doesnt cast shadows. The same thing for the glass meshes. 
Same Problem Here . Unreal 4.23.0 …skylight not working …
at any projects
here is my Screenshots …dont know what to do
^ this. You didnt say if you turned off casting shadows on those things.
This is simple, just delete the LightmassImportanceVolume and also the PostProcessVolume that the Datasmith creates automatically. Should work…