Yes, this needs to be set up through your custom launch parameters. If you send in a ticket with the mods you want, we can set up the correct launch parameters for you
Here's a little guide on how to whitelist admin Steam64 IDs.
Get your list of Steam64 IDs you would like to automatically admin your server upon logging in. It should be one Steam64 id per line. Stop your server from the control panel Log in to your server via an FTP client Navigate to \ShooterGame\Saved\ Create a new file here called AllowedCheaterSteamIDs.txt Paste the content of your list here and save Start your server and you should all have auto admin!
Do you have a open support ticket on this issue? Please send it here in the thread.
This is a billing question which must be resolved via support ticket.