Unturned uses a Game Server Login Token (GSLT) to identify the server in Steam services. Your Steam account must meet Steam's current requirements for creating game-server tokens.
- Log in at https://steamcommunity.com/dev/managegameservers.
- Create a token with App ID 304930 and enter a descriptive memo, for example your server name.
- Copy the generated token and keep it private.
- Open the server-management panel and select Configuration Files.
- Click Text Editor for Config.json.
- Locate "Login_Token": "" and paste the token between the quotation marks.
- Save the file and start the server.