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Open the Home screen of PS4, and then navigate to the Settings menu and select Account Management. Select Restore Licenses and then click on Confirm if prompted. Wait for the process to complete. Then reboot your console and check if the Call of Duty Modern Warfare Multiplayer not working issue gets fixed.

The PlayStation 4 disc drive and hardware can't read PS2 or PS3 discs, so the easiest way to access your favorite old games is to use a PlayStation Plus Extra or Deluxe membership. The Extra tier provides access to the Game Catalog, which includes some PS4 titles.