I’ve seen others with this issue, but not on a Mac and not having all endpoints disappear.
Two days ago, I could play, via Roon, Tidal music thru my Cambridge Audio CVN v.2 endpoint. And my Yamaha receiver was another endpoint but I didn’t use it two days ago.
Today, I have no endpoints accept System Output which is my MacBookPro. The CVN input control shows Roon. But the CVN is invisible to Roon itself. I changed nothing in two days.
Rebooting, connecting, and reconnecting Ethernet cables, ensuring firewall is not blocking Roon (although I didn’t change it), etc. Nothing works to restore any endpoint except my MacBookPro which is also the Core and where all my music is stored.
BTW, I was just about to order a Nucleus to get Roon off my Mac but now not sure if endpoints just disappear.
Sincerely, Mike Davis