Setup No Check join list for your server

Step 1: Access the game server

Go to the game server overview page, and click the name of the game server.

Step 2: Add STEAM ID to No check join list

The 'No check join list' works like a VIP list. Users that have their STEAM ID on this list will always be able to join the server. Even when all slots are filled.
This is great for admins on a busy server, ensuring admins are always able to jump in-game.

Make sure to save the changes when you are done.