Join the intended lobby
The launch build includes a server browser and room codes. The host should create the room, send the code through a private channel, and wait until all three expected account names are visible. Confirm region or latency if the browser exposes it before assigning roles.
If joining fails
Check that every client is on the current build, restart the lobby once, and verify that firewall or network rules allow the connection. A room code is an identifier, not a fix for version or service problems. If the session remains unstable, test a different host and consult current launch notes before changing unrelated system settings.