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Modern Warfare 3 servers are down as of midday PT on Thursday, leaving many Call of Duty players unable to play campaign early access.
Activision issued a statement on Thursday, claiming it was looking into the server outage, which has also left many players unable to check accounts or progression.
“We are investigating a service outage impacting multiple titles,” it said. “During this time, Campaign Early Access, account ownership checks, and progression systems may be temporarily unavailable.
“We will provide an update as soon as we are able.”
Modern Warfare 3’s campaign was made available today via early access, ahead of the full game’s release – including multiplayer – on November 10.
Microsoft completed its $69 billion acquisition of Activision Blizzard last month, following over a year of legal battles to push the deal through.
Microsoft and PlayStation signed a binding agreement this year to keep Call of Duty on PlayStation following the acquisition, and Xbox boss Phil Spencer later reiterated Xbox’s pledge to maintain “100% parity” for Call of Duty across all platforms.