Buddypress extra profile fields not showing on Pro Sites signup

I've given up trying to use the Gravity Forms registration with Pro Sites, NPT & Multidomains. So after losing a couple of months trying, I'm back with just setting up Pro Sites but I have BP extra profile fields that need to be on the signup registration form. Unfortunately, none of the extra fields are displaying. Buddypress is on a subsite as our community site. Any suggestions?