Hi Dylan, thank you so much for your reply.
Yes, factory reset Poly, rebooted roon core.
All other devices normal, in fact, if I switch play mode on the Poly to “everything else” the Poly appears as an airplay device.
Switch back to roon and it disappears.
Kind regards
Mike
Hi Dylan
SOLVED---- I use a linksys mesh system, and it appears that if the Roon core is connected to node 1 and poly to node 2 they can’t see each other. I now have one redundant piece of expensive linksys kit!