how did i get banned from game

If the ban is an in game ban, then you will need to contact Activision or Sledgehammer Games, as they would have given the ban, not Xbox.

https://support.activision.com/

https://www.sledgehammergames.com/

Hello, Calibration T. I’m Arturo, and I’ll be glad to provide assistance with your inquiry today.

Can you review if your Xbox profile has an enforcement action, or is just Call of Duty modern warfare the only game that doesn’t allow you to play online?

Enforcement history:

https://support.xbox.com/help/family-online-safety/enforcement/enforcement-history

Thanks for your attention,

Arturo.

Note: Please refrain from sharing personal information, including an email address. As community users, we are not able to enter or check your account information, and everything we comment can be seen by anyone on the internet.

Hi there,

Unfortunately no one in the forums can respond to enforcement actions on accounts and the Enforcement Team does not use the forums.

To get more info you will have to go through the case review process at
enforcement.xbox.com if the suspension is longer than 24 hours.

Remember investigations take time so the suspension could have been for something that happened weeks or months ago.

Also note that naming and shaming in the forums is not permitted.

I told the same thing to customer service and Paolo F... ensured me that the forums were for the people who could not get a case review.

Hi and thanks for reaching Microsoft Xbox gamer's community. My name is Josef.
I'm an Independent Advisor and a Microsoft Xbox user like you.

Hope you're doing great today despite this Rusty

As your suspension last 48 hours, is not possible to undo or appeal to it, because the enforcement team takes up to 72 hours to review your ticket

Please note that no one here including Microsoft customer support is capable to assist you with suspensions or enforcement actions.

Because is not possible to access to your account and enforcement details.

The only way to do it is via this site: https://enforcement.xbox.com/

The enforcement team doesn't use the forums and we can't help you with suspension issues

To check your suspension or if eligible for a case review:
https://enforcement.xbox.com