Baking problems with Interior mesh

So I made this really simple mesh in Blender, it’s a simple interior (I checked the normals, so those shouldn’t be a problem) When I exported it in Unreal, and then baked the lighting everything seemed off.

Here is my wireframe:

As you can see, the wireframe is really simple, so I thought that might be the problem. So I decided to make another mesh in Blender, this time with a lot more geometry, to see if this would fix my problem.

After baking the mesh again, the problem continued. (Both meshes are set to static)

Here is a view of the lighmap density for both meshes. if I’m not wrong, this lightmap resolution should be enough for what I want. Any suggestions?