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Distance field ambien occlusion nightmere

I have this model that comes from Rhino 6 through Datasmith.
When I enabled Distance field Mesh, the whole building became dark and full of stain like shadows.
I am using unreal 4.26.2 I have tried to rebuild the UV maps of some geometry but it doesn’t seems to work either.!
I have adjusted the settings on the skylight, world settings and even inside the single mesh.
When I go into the mesh editor, I can make the Ambient occlusion splotches dapperer adjusting the settings and increasing light map size. But when I see the same geometry in the scene still has that nasty look.
I reviewed the Rhino model there are lost of single plane geometry, mostly the ceilings, will this affect the Distance field mesh??
Your help is appreciate.
distanceField|686x500