Hi William29150,
Thank you for reaching Microsoft Community. We appreciate for sharing your concern to us.
I am aware of your desire in trying to install Windows 11 on your new Surface Pro 8. However, it's important to note that the Surface Pro 8 comes with Windows 11 pre-installed, so you don't need to install it manually.
- Would you kindly confirm and check the Windows version that is currently installed on your device? On the search box type Winver and hit the enter key.
If you're experiencing issues with the installation process, it's possible that the ISO image you're using is not compatible with the Surface Pro 8.
Please let me know and I'll do my best to assist you further.
Kind regards,
Lavenia