Do you know if there's some firewall issue with the Mac? I'm able to get it to work on my Mac, although it's a pretty old MacBook air.
Viewing post in My Heresphere can’t connect to Quest 3—via SMB or XBVR.
I have disabled the firewall before and still wouldn't work, not sure if there are any other issues. I have the 2020 Macbook air, also i've recently got a new router and thought that might do the trick but still no change just the same error message after a few minutes of entering the URL into the Heresphere web browser.
If you can't load it in your phone's web browser, then the issue stems from your Mac/router/xbvr. You can try asking for help on the xbvr discord: https://discord.gg/wdCHXAG. Maybe some recent MacOS updates are preventing xbvr from communicating properly over your network.