After announcing Windows 11, Microsoft released a new tool called PC Health Check that can be used to check whether a PC is eligible for Windows 11 or not. Based on the customer feedback, Microsoft yesterday released a new version of PC Health Check app that shows why your PC is ineligible for Windows 11. We noticed that many users got “The processor isn’t supported for Windows 11” message, so we would like to clarify the supported CPU situation to our readers.

All Windows 11 supported processors should have TPM 2.0, but that’s not generally a blocking requirement.
There are more requirements than just TPM 2.0 support. For example, Intel 7th gen Core processors have TPM 2.0, but they are not supported to run Windows 11.
The below Intel, AMD, and Qualcomm CPUs are the currently supported CPUs. The lists will evolve over time, but these are the supported CPUs for now.

https://mspoweruser.com/microsoft-support-windows-11-intel-amd-qualcomm-processors/