Games with keyboard and mouse on console

You don't, consoles use a controller....

The mouse will never work.

The keyboard is helpful for text.

Console games are NOT programmed to use a Keyboard/ mouse.

There are some games that do use a keyboard/mouse combination if the player chooses to use it. https://www.windowscentral.com/list-xbox-one-mouse-and-keyboard-games

And here's some information on how to set up the Keyboard/Mouse on the console https://beta.support.xbox.com/help/Hardware-Network/accessories/mouse-keyboard

I'm not a big fan of Mouse and Keyboard support for consoles but i don't have a problem with it if games keep Mouse and Keyboard users and Controllers users separate, as Mouse and Keyboard users have a huge clear advantage over Controller users.

Hello

It would be down to the Game Developers to implement Keyboard and Mouse controllers in to the game.

Xbox have give game developers the tools and the console does support Keyboard and Mouse inputs

Some games on the Xbox One or Series X|S do support keyboard and mouse. So if you use a keyboard and mouse just by plugging them into the usb ports on the Xbox console, then no it is not a bannable offense. It can be though if you use an unofficial adapter to play on games that do not support keyboard and mouse.