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It appears that any device running on an Intel 7th Generation (Skylake) CPU or earlier will also trigger that compatibility check. Update: Here, too, Microsoft has edited the pages at its Microsoft Docs site (normally the authoritative page for documentation) and removed all references to CPU Generation and Hard Floors and Soft Floors. Frustratingly, the documentation simply says this is defined by "CPU Generation," without going into any additional details.
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Yes, there's also a Soft Floor requirement for CPU. If the compatibility checker still insists that you can't run Windows 11, and you've confirmed that the TPM isn't the sticking point, the problem might be a CPU that Windows 11 considers too old.
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