All physical edition pre-orders of Call of Duty: Modern Warfare II include a code to register for early access to the Call of Duty: Modern Warfare II Open Beta*. In most cases, the Open Beta code will be printed on the retail receipt or sent to you via email on an online receipt. Please contact your retailer if you didn't receive your Open Beta code or can't locate it.
If you digitally pre-ordered Call of Duty: Modern Warfare II through the PlayStation Store, Xbox Store, Battle.net, or Steam, you don't need a code. You're automatically registered to participate in the Call of Duty: Modern Warfare II Open Beta* on PlayStation 5, Xbox Series X|S, PlayStation 4, Xbox One, or PC.