First, make sure you press enter after inputting the XBVR web address, and see if the XBVR webpage loads. If it doesn't, try restarting your router (unplug the power for 10 seconds, then plug it back in), Mac, and Quest 3. Make sure the XBVR app is running on your Mac (the terminal should be open). Then try accessing the xbvr webpage from your smartphone (or any device that isn't your Mac). If it's able to connect, try using the HereSphere web browser again. Use the url's that begin with 192 as well (make sure to include http:// in the url, not https).