Blending Layered materials SSS + Metallic

So Im trying to do a material that blends 2 function materials, but when I do check the “use material attributes” box, the main node apears as (Customized UV5) and disable the conection with the MatLayereBlend_Standard node. Do you know why is this happening?

And another question is. Can I blend a subsurface with a metallic material?

Thanks