I can't add groom bind to my MH mustache

I have a strange problem where I can’t attach the groom binding to the mustache in my metahuman, all the other grooms are working fine, only the mustache won’t be added, any fix?

I have the same problem… any solution?

It seems to be a bug while exporting from bridge, the fix was so easy to apply, you need just to apply your character face mesh in the binding asset, here’s a pic :