I’m putting this up as a duplicate of my recent post detailing how to bypass TPM checks when installing Windows 11 on an Intel-based Mac mini with 8th-gen CPU.
First you need to have macOS up and running on the Mac mini. I installed macOS Sequoia and ensured I had all current updates installed.
Next, download the Windows 10 ISO from Microsoft. Select Windows 10 (multi-edition ISO), select your language (here in Australia, don’t go for English International, pick English (United States) as we use a US keyboard layout here, and you can change the system language in the installer) and then grab the 64-bit download.
https://www.microsoft.com/en-au/software-download/windows10ISO
Using Boot Camp Assistant, install Windows 10 as usual. After the installation, let the Boot Camp setup app run and install all the necessary drivers, and then install all outstanding Windows Updates. Reboot and install all outstanding Windows Updates. Rinse and repeat until there are no more updates to install.
Get the PC Health Check app from Microsoft: https://aka.ms/GetPCHealthCheckApp
Run the PC Health Check app, and hit Check Now. It will tell you that the PC doesn’t currently meet Windows 11 system requirements as TPM 2.0 must be supported and enabled.
Quit the PC Health Check app and then open Regedit and navigate to HKEY_CURRENT_USER\Software\Microsoft\PCHC
Set UpgradeEligibility to 1
Then go to HKEY_LOCAL_MACHINE\SYSTEM\Setup\MoSetup and set AllowUpgradesWithUnsupportedTPMOrCPU to 1
You can then run the Windows 11 Installation Assistant and proceed with the upgrade.
Edit: This almost, but not quite worked.
In the end I got it working by downloading this CMD file to skip the TPM check:
I downloaded it to the desktop, launched a CMD prompt as Administrator and ran the file. I then rebooted and was able to kick off the Windows 11 upgrade.