How To Fix The Attestation Requirement Error In Call Of Duty: Modern Warfare 4

Call Of Duty: Modern Warfare 4 - How To Enable TPM 2.0 And Secure Boot Published Oct 23, 2026, 6:21 PM EDT Allyson Cochran is a Chicago-based Editor at TheGamer who has worked as a journalist since 2020 and in games journalism since 2022. She holds a bachelor’s degree in journalism and focuses primarily on guides, previews, and developer interviews, with particular expertise in cozy indie games and live-service FPS titles. She has interviewed numerous game directors, including those of games like Overwatch and Dead by Daylight. Allyson has written and edited thousands of guides, and she genuinely loves every minute of it. Getting ready to jump into Call of Duty: Modern Warfare 4's multiplayer only to be greeted by a security warning? Nobody wants their gaming session interrupted, especially when all you want to do is load into a match. Thankfully, enabling TPM 2.0 and Secure Boot is usually pretty straightforward, even if poking around your computer's BIOS sounds a little intimidating. These security features help keep cheaters in check and make multiplayer a fairer experience for everyone. If your PC isn't quite meeting the requirements yet, don't panic! Here's how to check your settings, enable both features, and get back to gaming. How To Check TPM 2.0 And Secure Boot First, check if your PC already has both features enabled. You can do this through Windows without changing any settings. Press Windows + R, type tpm.msc and press Enter. Confirm the TPM is ready for use and lists Specification Version 2.0. Press Windows + R again, type msinfo32 and press Enter. Confirm BIOS Mode says UEFI and Secure Boot State says On. How To Enable TPM 2.0 And Secure Boot If either feature is disabled, you'll need to enable it through your PC's BIOS or UEFI settings. The exact steps vary depending on your motherboard. Restart your PC and enter BIOS or UEFI settings through Windows' Advanced Startup options. If you have Windows 11, that's Start > Settings > System > Recovery, then click Restart now next to Advanced startup. Find the TPM setting. It may be called AMD fTPM on AMD systems or Intel PTT on Intel systems. Enable TPM, save your changes, and restart your PC. Enter the BIOS or UEFI settings again and find the Boot or Security tab. Enable Secure Boot. You may need to disable Compatibility Support Module (CSM) or Legacy Boot first. Save your changes and restart your PC. Repeat the checks above to confirm that TPM 2.0 is ready for use and Secure Boot is on. Save your changes, restart your PC, and check both settings again. If your system uses Legacy Boot, you may need to convert your drive from MBR to GPT before switching to UEFI. If you're unsure, consult your motherboard manufacturer, and never clear or delete TPM keys.