(Xbox Series S) How do I play co-op with my girlfriend

Hi, Aaron. My name is Ron, I'm an independent advisor. I will be more than happy to help you.

If the game doesn't support split-screen gameplay, you will need to use two consoles and two Xbox Live accounts to be able to play with each other.

Gears of War series (which I see you have) and the Left 4 Dead series. Both, my girlfriend and I have enjoyed co-op. I'm not sure if you're in the same boat as me, but I got myself a stabbing, shooting, executing superbtch that loves to kill anything that
moves on screen.

Merely sharing one's account is against Xbox Live's ToS and could result in getting your console banned. No way in hell would I let anyone access to my account. The only time I would allow it if were my child (which I currently do not have) or a girlfriend
wanting to access Netflix/Hulu (see previous parentheses section).

Having said that, I would allow my friend(s) to sign in under their own profile on my Xbox if we were playing co-op or something.

Co-op only? Ewwwww. I guess I will give it a try, or let my son do it. Any certain missions? Or how do you unlock it in Co-op, Ive never done Co-op. Do you just select it and play with it a certain amount of time or what? Thanks.

Are you trying to sign your kids in as a guest? or do they have there own accounts?

I asked because I'm able to sign into the local co-op in that game with my account as player 1 and my girlfriends as player 2.