Can You Cross-Play Different Call of Duty Games on Xbox Live? No

No. Each Call of Duty title runs on its own dedicated matchmaking pool. You can only match with players running the **exact same game version** (same title, same patch).

Why Cross-Game Play Isn't Possible

• Different Engines/Maps/Weapons: Modern Warfare (2019) vs. Black Ops Cold War vs. Vanguard have zero shared assets.
• Separate Lobbies: Xbox Live matchmaking uses Title IDs; COD 4 ≠ MW2 ≠ MWII.
• Balance/Progression: Prestige, battle passes, gunsmiths are title-specific.

What *Does* Work

• Cross-Platform (Same Game): Modern Warfare II/III (2022/2023), Warzone 2.0, Black Ops 6 support Xbox/PlayStation/PC cross-play.
• Backward Compatibility: Xbox One/Series plays COD 4, MW2, BO1/2, Ghosts, AW, BO3, IW, WWII via disc/digital—but only with others on that same legacy title.

Coordinate with friends to buy/launch the same CoD.