This guide explains how to fix the attestation requirement error in Call of Duty: Modern Warfare 4.
Fix the Modern Warfare 4 attestation error by verifying TPM 2.0, UEFI, and Secure Boot in Windows, then enable them in BIOS or convert MBR to GPT.
Background: A security warning can interrupt the multiplayer session
A player preparing to enter Call of Duty: Modern Warfare 4 multiplayer may first encounter a security warning instead of loading into a match. The warning points to two PC protections: Trusted Platform Module 2.0 and Secure Boot.
These protections are tied to fair play. They help keep cheaters in check and make multiplayer a fairer experience for everyone. If the PC does not already show the required state, the next step is to verify the settings before changing anything.
Before changing anything: checking the current status in Windows
The first timeline marker is a read-only check inside Windows. It can confirm whether the machine is already ready.
Press Windows + R, type tpm.msc, and press Enter. The system should show the Trusted Platform Module as ready for use and list Specification Version 2.0.
Press Windows + R again, type msinfo32, and press Enter. Confirm that BIOS Mode says UEFI and Secure Boot State says On.
If both checks pass, the PC already matches the warning’s requirement. If either check fails, the next step is to adjust the PC’s BIOS or UEFI settings.
Enabling Trusted Platform Module 2.0 and Secure Boot from the firmware settings
If Trusted Platform Module 2.0 or Secure Boot is disabled, restart the PC and enter BIOS or UEFI settings through Windows' Advanced Startup options.
For Windows 11, the path is Start > Settings > System > Recovery, then click Restart now next to Advanced startup.
Inside the firmware settings, find the Trusted Platform Module setting. It may appear as AMD fTPM on AMD systems or Intel PTT on Intel systems. Enable TPM, save the changes, and restart the PC.
Enter BIOS or UEFI settings again and find the Boot or Security tab. Enable Secure Boot. The option may require disabling Compatibility Support Module (CSM) or Legacy Boot first.
Save the changes and restart the PC. Then repeat the Windows checks to confirm that Trusted Platform Module 2.0 is ready for use and Secure Boot is on.
If Legacy Boot, Master Boot Record, or Compatibility Support Module blocks the change
Some systems still use Legacy Boot. In that case, the drive may need to be converted from Master Boot Record (MBR) to GUID Partition Table (GPT) before switching to UEFI.
If the process is unclear, consult the motherboard manufacturer. During any Trusted Platform Module adjustment, never clear or delete TPM keys.
Where the fix stands now
At this stage, the resolution depends on local PC settings rather than a game update. The key checkpoints are Specification Version 2.0, BIOS Mode UEFI, and Secure Boot State On. Once those states are confirmed, the security warning should no longer block Call of Duty: Modern Warfare 4 multiplayer.
Frequently Asked Questions
What does the attestation requirement error in Call of Duty: Modern Warfare 4 mean?
The error is a security warning that blocks multiplayer sessions when the PC does not meet the required state for Trusted Platform Module 2.0 and Secure Boot, protections tied to fair play and cheating prevention.
Do I need a game update to fix the error?
No. The article states that the resolution depends on local PC settings rather than a game update.
How can I check whether my PC already meets the requirement?
Press Windows + R, type tpm.msc, and confirm TPM is ready and Specification Version 2.0 is shown. Then press Windows + R, type msinfo32, and confirm BIOS Mode is UEFI and Secure Boot State is On.
How do I enable Trusted Platform Module 2.0 and Secure Boot?
Restart the PC into BIOS or UEFI settings through Windows Advanced Startup, enable the Trusted Platform Module setting (such as AMD fTPM or Intel PTT), then enable Secure Boot in the Boot or Security tab. If needed, disable Compatibility Support Module or Legacy Boot first, then save, restart, and recheck the Windows settings.
What should I do if Legacy Boot or MBR blocks Secure Boot?
Some systems may require converting the drive from Master Boot Record to GUID Partition Table before switching to UEFI. If the process is unclear, consult the motherboard manufacturer, and never clear or delete TPM keys during the adjustment.
TagsModern Warfare 4Call of DutyTPM 2.0Secure BootPC troubleshooting
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