Why when my wife in the same house cannot join my game on mw3 yet i can join her. When she...

I have 3 pc's in my house, mine, my wifes, and my sons. We all got the SoD2 Ultimate edition. I can join my sons game and so can my wife, my son and wife can join my game, my son can join my wifes game but i cannot... wtf? we are all on the same connection
and play tons of other games online together so this one has me confused as to why i cant join her game but she can join mine. Ive already tried all the suggestions they have on the support site and none of those has worked so i am at a loss

Hi Odins , my name is Rodrigo. I'm an Independent Advisor and a member of the Microsoft community and I'd love to assist you today.

I am sorry to hear that.

Please, make sure to make your XBOX the home console of your account (the own that owns the game and susbsripton).

This assuming you have one copy and one subscription active.

Take a look here for a detailed guide: https://support.xbox.com/help/hardware-network/console/my-home-xbox

Press the Xbox button on your controller to open the guide.

Select Profile & system > Settings > General > Personalization, and then select My home Xbox.

To make this your home Xbox, select Make this my home Xbox.

Let me know if it works!

My girlfriend and I are running 2 Xboxs of the same router. She is having this same problem but I am not. It only happens when she starts up multiplayer on MW3. Black ops works just fine. We even swapped MW3 discs and she still cannot sign in to multiplayer.
She is even having trouble signing into the Xbox live iPhone app. It kicks her only when she starts up multiplayer. And when she dashboards it automatically signs her back in. But she cannot join any party's or except invites or read messages. Seems odd.
The message she gets is "connection to Xbox live has been lost. Try signing in again".

Same issue here. We play on 2 Xbox one in the same house. My Wife no Problems, but i can´t host. Only join her game or offline its fine.

Same problem as everyone else. I tried to play with my sister, who's had no trouble joining other people's games, and I can't join her world and she gets the same message when she tries to join mine.