MC6 Pro with Boss Ev-1-WL

Hi, I have the MC6 Pro setup with bluetooth via 5 Din in/out and works perfectly controlling a Boss GT1000 core, Strymon Volante and Boss Re-202, also via Onsong. I can’t seem to send CC# messages via the Boss EV-1-WL to the Boss GT100 core. Has anyone had success with this?