How to fix ''Multiplayer'' error after Update 1.23 in Call of Duty®: Modern Warfare

*to check out your account region: login here and check basic account info https://id.sonyentertainmentnetwork.com/id/management/ *to check out the game disc region: read this topic. https://support.activision.com/community/s/question/0D54P00007IxpSxSAJ/solution-how-to-fix-missing-multiplayer-dlc-packs-error-in-call-of-duty-modern-warfare-multiplayer-dlc-packs-error-in-call-of-duty-modern-warfare