Remember that this is basically cargo cult practice to me.
There is a console that can be accessed with the backslash key. When pressed, the command line with >_ prompt appears in the lower left of the HUD. Often it is kind of hard to see because of the background.
You can type in commands and they will be executed.
typing in Players:teleport(222) then shows
hitting the enter key teleports you to polygon 222
which is the destination polygon the misbehavin terminal should teleport you to.
Notice that Players begins with uppercase and ends with s; Players uses brackets, teleport uses parentheses; there are no spaces.
Here is a topic that discusses using the console command line to solve a problem.viewtopic.php?f=23&t=39237&hilit=teleport
It is used mostly in development and should only be used in game play to overcome a specific issue such as the misbehavin terminal. In the above topic, I'm not sure that that is a good use of the console command in that it is being used to remedy a deficiency in gameplay.
In your case, I think it's a legitimate use and, in fact, perhaps the only way to continue the game.
This is speculation, but one of you is Players and the other is Players or similar since you are using the co-op script. I'd suggest one of you teleporting then setting a beacon or whatever the big green disk is called for the other player.
If that works but the terminal to get you out is also misbehavin, the return polygon is 260.
My comment was just a fanfic way of showing the console command that would take you where you want to go.
I hope this works, it's really a great game.
I just play 'em; I don't know how they work.