I have VirtualBox Version 6.1.28 r147628 (Qt5.15.2) on my Fedora 34 Workstation host.
This version of VirtualBox should support Windows 11, because it can emulate TPM 2.
I created a new VM with "Windows 11" type, but when I install it the setup still tells me that my machine doesn't meet the minimum system requirement:
Here is the Settings -> General dialog: