This is usually a formatting error. Try removing the dashes (e.g., XXXXXXXXXXXXX ). Alternatively, your key might be for a different region (European vs. North American). Download a "No-CD Patch" (legally allowed if you own the original disc) which often bypasses the local key check for single player.
: You can often re-enter or update a key directly in the in-game menu under Multiplayer Options -> Enter CD-Key . cod united offensive cd key
This report is to be destroyed by incineration or other approved methods after reading. Electronic copies are to be deleted and wiped from all systems. This is usually a formatting error
Finding or managing a CD key for Call of Duty: United Offensive XXXXXXXXXXXXX ). Alternatively