Update, June 25: Microsoft has released an update to the Windows 11 PC Health Check App with more detailed messaging on why a computer may not be able to update. The messages include lack of TPM, secure boot being turned off, too small a system disk or an unsupported processor.

We just made updates to the Windows 11 PC Health Check App. It now provides more detailed info on requirements not met. This should help in cases where folks assumed CPU compat issues were TPM related https://t.co/hTWMe16DWO pic.twitter.com/eZLTZMOdjTJune 25, 2021

https://www.tomshardware.com/news/windows-11-compatibility-checker-new-update-error