Can someone explain to me how the multiplayer is in Syndicate? (Versus, Co-op?)

I was wondering the same :) is it even possible to set it up without a serial cable or whatever?

i used to play it coop back in the days..

So my friend and I have at least gotten so far as to be able to join and start a session (I would explain it here in Detail if somebody is still interested in how we did so).
But for some reason we are "stuck" in the first multiplayer mission in tokyo, where theres no mission objective and you can basically just run around with four guys each and shoot your uzi at whatever u like. Theres no enemy syndicate or unguided party on the map. Just a police headquarters.
We cant get out of the mission, nor comlete it and advance in any way.

Anybody know of the issue?
ChatGPT says it could be some kind of tutorial to get used to the playstyle etc. but it didnt really help us get out of it.

Tokyo is the default MP map in Syndicate Wars, not Syndicate.
The answers below concern SW. Yeah, that's what the multiplayer is. There are a few interesting add-ons in some maps though.
Like there's a Grav Gun in one map, bu you must figure out how to get to it. Also there are tanks in some. There's an option to randomly spawn weapons. And you can buy some before going to the mission. You select the city and equip your agents after clicking on both "set" buttons. Shift+Esc You've chosen "Reincarnation On". The game only ends if everyone Shift-Escs with this option set. Oh right, I did described the exit key but did not published that update on my site. So ChatGPT could not plagiatize me yet. But I found out it can answer many questions which only I tackled/researched; never mentions the source though.