Error 6036 Multiplayer call of duty MW

All I can find is guides for Windows 10, not for Xbox, so I'm assuming you are playing on PC. Anyway here is one solution, hopefully it will help you

https://www.auslogics.com/en/articles/fix-dev-errors-in-call-of-duty-modern-warfare/

finally I gave him the head, to make him go erase everything you have in cache, and personally all the packs, after you change the region of settings and install it normally, so I did and it works, I wish you luck

I have had this problem before. It kicks me completely offline. It kicks my whole wifi offline.

I've seen several posts about people having issues getting CoD to work right now. They are receiving all sorts of different errors or just not able to launch/connect to the game. There have also been a lot of installation and download problems in the past
2 weeks with Xbox services. This is due to all of the people at home right now, due to worldly events, and being on Xbox more than usual. It is overwhelming the services and the servers and many games, platforms and apps are struggling to work properly. If
nothing else works, just keep trying, as Xbox has said they are trying to get all of the services working and to deal with the large amount of people on games right now. Hopefully this issue is resolved soon. But rest assured, you're not the only one having
issues with this game, or with downloads and installs. Many, many people around the world are experiencing this right now due to the large amount of people on the Xbox services. Xbox has acknowledged the issue and are working on it, so hopefully services will
be up and running like normal again very soon.

I apologize for not specifying that it is on the Xbox, my mistake