Safari 15 has NSURLSession Websocket enabled by default. This causes media to fail to connect and the following message is displayed:
To join CafeX via Safari 15 please disable the NSURLSession Websocket feature. To disable please complete the following on your relevant platform.
MacOS:
Selecting from the menu bar Safari > Preferences > Advanced and check Show Develop menu in menu bar
Select Develop > Experimental Features > NSURLSession WebSocket to remove the checkbox
Restart Safari
iOS:
Settings > Safari > Advanced > Experimental Features and move the toggle switch off for NSURLSession Websocket