Blender 2.8 material not applied to separate object

I created a separate object from the vertexes of another; materials don’t seem to apply to the new object:

The “Facade” should have a light brown color (same as the base of the building); but the color remains unchanged regardless of what material I attach to it.

You specify “vertexes”, but aren’t Materials attached to Faces??

Yes, managed to fix it (by apply the material to selected faces). I’m only curious why I can’t apply a material to a newly created object from vertexes.

Maybe<< because Blender is generating the Faces itself. Does the same thing happen if you copy Faces?

Yes, the same happens.

Okay, but why are you copying Vertices in the first place??? Why NOT copy Faces?