CS:GO requires that you use a token to pair your steam account to your server, without this you server will appear as a LAN server.
It was created to combat servers which are running illegal scripts such as weapons skins, to use this system you must create a token using this URL - http://steamcommunity.com/dev/managegameservers
In the APP ID enter - 730
In the MEMO parameter you can enter - https://streamline-servers.com/ OR a description which matches your service.
Once you have created your token you must go to the 'Commandline Manager' on TCAdmin and then select the 'Custom Commandlines' tab - here you will click 'New' - once you have done that simply enter your token in the 'Steam token' parameter.
After creating this new custom commandline, you will need to click "select" on the far right to ensure that your service loads this new commandline.
*Make sure that you tick the checkbox to the left.