When exporting PBR set, BaseColor always renders Black

Whenever I try exporting a texture in the UE4 format - PNG (though it happens for any format) (for example a white wall) in preview it shows correctly even in the “BaseColor” tab. But when exported it ALWAYS no matter the setting exports a black square according to the resolution. The rest of the PBR set is correct tho (Basemetalness, Height, Normal, Specular roughness). 

So when I end up connecting it up in UE, its all grey-black-ish for any texture.