Crossplay between Call of Duty: Black Ops Cold War and Warzone PC has been temporarily disabled as the recently released Cold War update is causing problems. The update contained the contents for Season 1.
Unfortunately, this update is causing problems for many PC users as they can’t access the multiplayer mode. Players have reported that they receive the ‘Zed 398 Swift Clover’ error upon accessing the multiplayer mode. Treyarch has tweeted about the issue, stating that we are investigating the issue with our developer for the PC version of the game, Beenox.
To keep the game lobby healthy and full, Treyarch has temporarily disabled the crossplay for PC users until the issue is completely resolved.
You can play Call of Duty: Black Ops Cold War and Warzone on PC, Xbox Series X|S, Xbox One, PlayStation 4, and 5.