

If you downloaded the ISO directly from Microsoft, that's going to be named something like "Win11_22H2_English_圆4v1.iso" - thats's Windows 11 for Intel CPUs. That's a Windows 11 for ARM ISO and this will not cause the message to appear. If you built the ISO using the instructions in the guide (which requires the download of a script and a couple of open source utility packages), you'll get a ISO that is named something like "_release_svc_refresh_CLIENTCONSUMER_RET_A64FRE_en-us.iso" (where the en-us will be replaced by the language that you selected for build). What is the name of the ISO file that you are using to install and where did you get it from?

You most likely have the wrong architecture ISO file.
