To fix MW2 Vault Edition not being available or working, players should do the following: On PS5 and PS4, restore licenses. Go into the console’s System Settings and follow this path: Settings
Head to the Invite Players tab. Choose the players/friends you want to invite from your friend list. Go back to the Party tab in the Social menu. Click on Party Settings to edit your Party’s privacy settings. Hopefully, this solves any bug related to Activision account ID or COD Modern Warfare crossplay. But if it doesn’t work, try a couple
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