https://www.theverge.com/2018/9/25/17903312/microsoft-xbox-one-keyboard-mouse-support-razer-features

Microsoft is enabling keyboard and mouse support on the Xbox One. Select Xbox testers will be able to trial this new support in the coming weeks, and Microsoft is teaming up with Razer so Xbox One users can purchase hardware that taps into the company’s Chroma lighting effects. Most wired and wireless USB keyboards and mice will work on the Xbox One, and it will be up to developers to support this in games.

“Mouse and keyboard input is not enabled by default for games,” explains Jason Ronald, director of program management for Xbox. Each development team knows their titles best and we support them in creating the right experience for their games as they see fit, to ensure an optimal and fair gaming experience.”