Call of Duty: Modern Warfare 4 Blocks Online Play Without Secure Boot

Campaign remains available when PC attestation fails

Call of Duty: Modern Warfare 4 blocks Multiplayer on PC when its security attestation requirement is not met, although the Beta’s Campaign mission remains available.

When I started the Beta on PC, Multiplayer was locked with an “Attestation Requirement Not Met” warning. Campaign remained selectable, meaning the game still launches without Secure Boot, but its online modes cannot be accessed.

The Modern Warfare 4 Beta is now live, but PC players need Secure Boot and TPM 2.0 enabled before they can enter Multiplayer.

Call of Duty: Modern Warfare 4 Beta Trailer

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What PC players need to check

Activision confirms in the official Beta patch notes that TPM 2.0 and Secure Boot must be enabled to play online. The security features support RICOCHET Anti-Cheat by making system-level tampering more difficult.

Press Windows Key + R, enter msinfo32, and check that BIOS Mode says UEFI and Secure Boot State says On.

If Secure Boot is disabled, our earlier Secure Boot guide explains how to check the setting and enable it on a Gigabyte motherboard. BIOS menus vary, so check your motherboard documentation before changing anything.

Call of Duty: Modern Warfare 4 Beta

Beta: Early Access August 21–25 / Open Beta August 28–September 1, 2026

Genre: First-Person Shooter

Developer / Publisher: Infinity Ward / Activision

Platforms: PC — Steam, Battle.net, Xbox on PC / PlayStation 5 / Xbox Series X|S / Nintendo Switch 2

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