Modern Warfare 4 will not let you into a single online mode without TPM 2.0 and Secure Boot, and Black Ops 7 and Warzone lock Ranked. Read three Windows screens below: the page lights the link that is broken and gives you the fix in the order your PC can survive — the disk before the boot mode, the boot mode before Secure Boot.
Your readings stay on this device, so you can restart into the BIOS and come back to the same place.
Pick what each screen shows. Leave anything you have not looked at yet — the chain marks it as unread.
Links 4, 5 and 6 depend on each other in that order. The TPM does not, and can be fixed in the same BIOS visit.
Start with any reading — the fix list builds itself as you go.
Start with step 1. The steps are in the only order that keeps the PC booting.
Everything you read holds. If the game still says Failed Attestation, the last step is for you.
Why here: An outdated Windows is also what the wizard reports as "TCG Event Log Failed".
Why here: The TPM does not depend on the boot chain, so it can be switched on in the same BIOS visit as the rest.
Why here: Switching settings on cannot fix a firmware version the server rejects; only a BIOS update replaces it.
mbr2gpt /validate /allowFullOSmbr2gpt /convert /allowFullOSWhy here: UEFI cannot boot an MBR disk, so the disk has to change first; switching the boot mode first leaves a PC that will not start. Microsoft’s tool converts without modifying or deleting the data on the disk.
Why here: Secure Boot only exists in UEFI mode — this is why the Secure Boot option is greyed out on a Legacy machine.
tpm.msc Windows key + R, type tpm.msc, Enter
Status: "The TPM is ready for use" means it is on. "Compatible TPM cannot be found" means it is off in the BIOS or missing. Under TPM Manufacturer Information, note the Manufacturer Name and Version.
msinfo32 Windows key + R, type msinfo32, Enter
System Summary: BIOS Mode should read UEFI and Secure Boot State should read On.
diskmgmt.msc Windows key + R, type diskmgmt.msc, Enter — right-click the Windows disk › Properties › Volumes
Partition style: GUID Partition Table (GPT) or Master Boot Record (MBR). Faster, in PowerShell: the last column of the command below.
Get-Disk | ft -AutoEvery maker names the switches differently and moves them between BIOS versions. These are the guides Activision itself links, one per manufacturer: how to turn the TPM on, how to turn Secure Boot on, and where the BIOS updates are.
Version 1.2.0, updated 16 September 2026. Extract the .zip, run CODSecureAttestationWizard.exe, accept the terms and start the scan; it lists every setting that needs changing.
It means the game could not confirm that your PC has TPM 2.0 and Secure Boot switched on. In Modern Warfare 4 that blocks every online mode; in Black Ops 7 and Warzone it locks Ranked Play and some playlists and can put you in a separate matchmaking pool. The fix is in your BIOS and your Windows disk, not in the game.
Yes, both. Activision lists them as required for Modern Warfare 4 on PC, together with Windows 10 version 22H2 or later, or any version of Windows 11. Without them no online mode can be played.
Because the PC is booting in Legacy (CSM) mode. Secure Boot only exists in UEFI mode, so the boot mode has to change first — and UEFI cannot boot a disk that is still MBR, so check the partition style before you switch it.
Microsoft’s MBR2GPT tool converts the disk without modifying or deleting the data on it, but the change cannot be undone and the PC will only boot in UEFI mode afterwards. Run mbr2gpt /validate /allowFullOS first and convert only if it succeeds; Activision also asks for BitLocker to be off, no dual boot and no more than three partitions.
Activision lists AMD fTPM firmware of the form 3.*.0.* as not compatible: 3.92.0.5 needs a BIOS update, 3.92.5.5 is fine. Read it in tpm.msc under Manufacturer Version. A symptom is the enrollaik.exe prompt coming back after you approved it. Only a BIOS update from your motherboard maker replaces the firmware.
Run Activision’s Secure Attestation Wizard to see what the game sees, look for a BIOS newer than the one installed even if your firmware is not on the incompatible lists, and then report it to Activision at support.activision.com/tpm-report.
Source: Activision Support — Trusted Platform Module (TPM) 2.0 and Secure Boot for Call of Duty.
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