https://www.polygon.com/2018/11/14/18095091/xbox-one-november-update-keyboard-mouse-support-alexa-cortana

As promised, long-awaited support for keyboard and mouse controls is now available on Xbox One. Microsoft’s latest system update for the Xbox means games like Fortnite and Warframe can now be played with a keyboard and mouse, as well as with a traditional gamepad.

Later this month, games like Bomber Crew, Deep Rock Galactic, Strange Brigade, Warhammer: Vermintide 2, War Thunder and X-Morph Defense will also get support for keyboard and mouse controls. Children of Morta, DayZ, Minion Master, Moonlighter, Vigor, Warface and Wargroove will support the control scheme at a later date.