You can only have one copy of a unique item at a time

These errors can be caused by temporary server issues in a specific region.

Information on upgrade paths for standard Call of Duty: Modern Warfare

​There was an error when trying to save a new banner.

All Black Market Auction House purchases are final.

Information on error BLZHROPAY10010102

Parental controls may prevent purchases on your account.

Information on error BLZSC2PAY10010102

プレイヤーがメインでクエストを完了したと報告し、代替キャラクターでクエストを完了できない

Ottoがクエスト「The Way to an Otto's Heart」を受け取れなかった場合の対処方法