How to Play Call of Duty Zombies on Xbox One

You cannot play the original Call of Duty: World at War Zombies mode on Xbox One, as that game is not backward compatible. However, several Xbox One titles include full Zombies experiences:

• Call of Duty: Black Ops III – Zombies Chronicles: Remastered classic maps from World at War, Black Ops 1, and Black Ops 2.
• Call of Duty: Black Ops 4: Features a dedicated Zombies mode with multiple maps and the "Blackout" battle royale with zombie events.
• Call of Duty: Black Ops Cold War and Vanguard: Both include full-fledged, story-driven Zombies modes with modern mechanics.

So while the classic WAW Zombies isn't playable, you have plenty of great Zombies content on Xbox One.