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: Modern Warfare 2 Players Furious Over Cross-Play Options

How to Add Friends with Crossplay!

How is everyone playing local multiplayer?? : r/ModernWarfareIII

Activision - 9/19: Call of Duty: Modern Warfare Crossplay Beta: LIVE! PS4: Open Beta. Xbox/PC: Early Access Beta. Maps: King / Pine / Stack / Gun Runner / Hackney / Cave /

Is Modern Warfare 2 cross-platform?

Call of Duty®: Modern Warfare® II Editions, Benefits Detailed

Call of Duty Modern Warfare Cross-Platform Feels Very Smooth, 20v20 Takes Places On Larger Maps - Report

Is this new? I've been playing for about a month and don't recall signing into Activision, I tried my email but it doesn't work? There was a update it looks like.

How to Play Split Screen On Modern Warfare 2

Call of Duty: Modern Warfare II In-Game Account Registration

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

Call of Duty: Modern Warfare 2 lacks option to disable cross-play on Xbox and PC at launch - Polygon