Its supported with Windows 11 as shown in this article. Norton shouldn’t be giving that error. Is there a trial version of ANY antiviral software on the computer? If so remove it and reinstall Norton 360.
https://www.amd.com/en/products/processors/laptop/ryzen/8000-series/amd-ryzen-9-8945hs.html
Are you installing the Windows Store app version or the full install of Norton 360 from within your account subscription.?
SA