Clear the Cache of Your Console. Another common reason for the Call of Duty Modern Warfare Multiplayer not working error is the corrupted cache data. In this case, you can try clearing the cache files on your PC or console to fix the issue.

From COD HQ, head to the Modern Warfare III section and select the Campaign tile. Even though the game has already launched, we don't want to spoil anything about it. Follow the prompts when starting the Campaign to choose your difficulty setting and then get right to it.

Once you create your Online ID, you can get started with all of our online services, like online gaming with PlayStation Plus, downloadable games from PlayStation Store, TV and movie streaming services and everything else that your PS4 can do online.

Call of Duty Online (also known as CODOL, CODO, and Call of Duty: Online, Chinese: OT}SU$Online; pinyin: Sh
mng zhohun Online) was a free, online first-person shooter video game developed by Activision Shanghai and Raven Software.