If you can't connect to the Teamspeak server using ts3server://321dive , try these methods.
Update your client.
Tested Client Versions - TeamSpeak 5, TeamSpeak 3.3.2 ++
Old versions from http://ftp.4players.de/pub/hosted/ts3/releases
We will recommend to use "ts3server://321dive" instead of ip or domain name , Because if the server changed it will point to the new IP address.
I hope that you have a good day !!