Call of Duty: Modern Warfare Requires an Activision Account For Cross-Play

Call of Duty: Modern Warfare will feature cross-platform play on PC, Xbox One and PS4. In order to achieve this though, Activision have had to make Activision User IDs mandatory. Here

Call of Duty Warzone 2 Crossplay & Cross-Platform Breakdown

Buy Call of Duty®: Modern Warfare® II - Cross-Gen Bundle

Call of Duty®: Modern Warfare® II and Call of Duty: Warzone™ 2.0 Season 01: Everything You Need to Know, Including DMZ

Call of Duty Modern Warfare 2 - How to Crossplay, Add Friends, & Fix Friend Requests

Is Modern Warfare 2 cross-platform?

Call of Duty Modern Warfare Cross Play - Everything You Need to Know

Please Tell Me This Is A Joke. Now I Need An Account To Play The Single Player And Offline Multiplayer??? : r/gaming

How to add your friends to your Activision account in Call of Duty: Modern Warfare

Call of Duty: Modern Warfare Preview - How Crossplay Works - Game Informer

Do you need an Activision account to play Modern Warfare?

Modern Warfare crossplay: How to play with pals on all platforms

Is Modern Warfare 2 cross-platform? PC, Xbox & PlayStation crossplay guide - Charlie INTEL