why AO does not work in marmoset with having value of 1 metallic in material from substance painter?

Zaikoni

why AO does not work in marmoset with having value of 1 metallic in material from substance painter? Having anything below that value AO still works in marmoset ? Is there reason for this or is this a bug ? My friends made tests also and they had same thing happening.

poopipe

I'm not familiar with the Shader internals but generally here's no diffuse component to metals so you can't occlude diffuse lighting as you would with a dielectric material.

If you have a specular or specular level input you could try inputting a map there

Obscura

^This. Full metals has only specular lighting and no diffuse.