Can't slot in or gets kicked back to role select by the mission?

Gets into the mission and gets kicked out during slot ini.

Let me provide more information to save a little bit of time:
-Message is given upon "slot kick" "No rebel commander or previously a rebel". Tried several things including restarting the whole dedicated having him wait until we took a blufor outpost before attempting to join as blufor.

-Little to no mods that are unsupported. Advanced towing, RHS, and goko ballistics.

-Parameters are set to disable the member system and allow for fast traveling anywhere.

-Pretty much a fresh save, nothing special about it.

-Tried making a fresh profile to join PVP slots encountered the same result.

-No edits were made to the mission file, or it's contents.

-No outside parameters other than enabling hyper threading with TADST.

And one of the rebels is the commander when they join the pvp side?

Correct.

interesting, I'll have a look into the code to see why this may be happening, as this is not a problem on the official server where the player count is much higher.

So, from looking into the code, your PvP player is triggering a Join In Progress check. This means that they MUST join after the mission is fully up and running. IE the rebels have loaded in and had the little cutscene.

This is due to a check designed to prevent PvP players from joining when there are no rebels in game.

Try launching the server with only the rebel player in the lobby, then have you PvPer join once you've had the cutscene.

Alright thanks!