In short, it is a configuration problem.
Check out this thread:
To quote myself on the subject: Don’t. It’s a hassle, not worth the effort, and it seems the servers will return to the “legacy” channel chats without Matrix anyway.
To your exact problem: I guess you are running the default compose stack, which tries to get letsenc SSL certs but fails as you said you are not using a domain. You need to run the HTTP override stack for that to work. Also, you don’t need all of the containers for a server without a license, and since there are no licenses for TS5 available yet, they don’t matter.
Since you can’t even test the Homebase functionality with current clients, I’d strongly recommend not wasting time on this server version. You can try the newer non-public server version on the Official Community TeamSpeak servers found on your dashboard.
