By disabling/unchecking the "Iris Normal Map" I was able to correct the issue. It seems that this is enabled automatically when first imported with the Auto Import Plugin. 

These are normal cc3 eyes, but were imported through iClone to Unreal 4.25.3 via the “Auto Importer”.

thats strange , never had that , are that normal CC3 eyes?  Or game eyes?

Continuing my journey into the eyes imported from CC3/iClone to Unreal via Auto Import. The iris' appear horizontally squeezed and don't seem to hold highlights well no matter where spot lights are place... even if lights are moved very close to the character. Adjusting roughness, specularity, and iris refraction didn't seem to have any effect on the reflectivity of the eyeball.