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You could also try resetting your BIOS to factory defaults, as that sometimes unlocks greyed-out options.

This happened to me. I finally got it to work by temporarily disconnecting all my external drives and USB peripherals except the mouse and keyboard.

Yeah, that registry workaround is a thing, but have you double-checked your BIOS to see if the TPM is just disabled in there?

Agreed. Yeah, that'll do it. You can check the official CPU compatibility list on Microsoft's site to be sure. Hope that helps.

Agreed. You could also try using a tool like Rufus to create a Windows 11 installer that bypasses those checks. Hope that helps.

Yeah, that BIOS update was the key for me too. After I did it, the Secure Boot option just appeared in the menu. Let me know if that works.