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June 9th, 2026 11:59
XPS 8940 - Purchased 2022 - Warzone/COD Attestation Failure
My system is completely up-to-date running Windows 11. I believe I may have a BIOS issue, although I have the latest available BIOS update already installed. I'm seeing that I need to contact support and reference "TPM Attestation Failure on Dell Computers". However, I can't seem to get a human because I no longer have a warranty. Is there any insight here?
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ispalten
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June 9th, 2026 14:12
Google "TPM Attestation Failure on Dell Computers" and you'll see some steps that might help.
Also Google "Warzone/COD Attestation Failure" as there are others that hit it as well.
It does seem to be a problem with the programs not reading TPM chip, but if you have the latest Dell XPS8940 BIOS, I don't think Dell will help you. It is 'out of service' and considered a 'legacy' system.
lvassar
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June 13th, 2026 21:09
I waited patiently and there's still no resolution. I've moved to a console, and it's working fine.
I will say this, I will never purchase another Dell product. I have an XPS 8940 with an RTX 3060, and I can't play the latest games, not because of hardware limitations, but because Dell decided to no longer support a four year old system. I believe this is an attempt to push the trade-in program
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gartaud
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June 20th, 2026 23:19
What does it tell you if you run the "Call of Duty Secure Attestation Wizard" that you can download from Trusted Platform Module (TPM) 2.0 and Secure Boot for Call of Duty ?
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lvassar
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June 21st, 2026 00:12
@gartaud
According to the Attestation Wizard, I have TPM 2.0 and Secure Boot enabled. However, because Dell will no longer update the Microsoft certificate via BIOS updates, I can't play. It's some type of certificate dated 2023 because the current one expired this month.
It's all a sham, really. Dell should be ashamed.
gartaud
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June 21st, 2026 00:54
@lvassar Dell should indeed be ashamed (this is what I think of this 2023 secure boot certificates fiasco: Dell deleted my thread complaining about the sad state of affairs of older XPS computers, the June Windows update and secure boot! | DELL Technologies) but maybe you can follow the manual procedure that works for the XPS 8930. See XPS 8930, purchased 2018, 2023 Secure Boot Certificates | DELL Technologies ?
You can start at https://www.dell.com/community/en/conversations/xps-desktops/xps-8930-purchased-2018-2023-secure-boot-certificates/699cdb010daada5e7a6c379f?commentId=6a3364af7acfb35b00eb2038
Noe that you may have to then perform the steps described at https://www.dell.com/community/en/conversations/xps-desktops/xps-8930-purchased-2018-2023-secure-boot-certificates/699cdb010daada5e7a6c379f?commentId=6a310e4bec435d7ccce55b7c so consider also copying the files needed for those steps on the USB key upfront.
Good luck!