Run the PC Health Check app available here. It is more than TPM in your case. Your CPU appears to be  pre-generation 8 and MS has drawn the line at Gen 8 for compatible systems. This is a Microsoft decision and has many manufacturers including Dell with systems that do not meet the minimum requirements.
TPM 2 is not supported. I bought this for $1700. Why can't I run Windows 11?
15 R3, Windows 11 not supported, TPM disable