I have no experience on this, but looking at your project I think you need to enable the ‘Lightmapped’ option on the render component of your entities.
There were some issues with accessing assets earlier. E.g. skybox could be missing in the Editor, etc. It was probably related. This should be fixed now.
I just baked the light maps in blender and bring them to light maps of material and it worked perfectly ,i even dont check light map texture for per entity