Actually seems you can, as that wasn’t the issue. Your forcing me to go look at the exclusive mode slider made me realise I had the surface set as a private zone. That off and everything worked (even with exclusive mode ticked)
Thanks for getting me looking in the right place though!
Here’s a fuller explanation then…
I could see the setting in my head and knew it was the setting that wouldn’t allow inclusion but couldn’t remember the name so wrote exclusive down. However on seeing Private could see that was the correct name.
I’m not sure why you feel the need to critique my behaviour but I hope this explanation satisfies your inner turmoil.