The time Microsoft announced Windows 11, it was discovered quickly that it has made some drastic changes to the system requirements. There are some strict system requirements on which CPU are supported by OS. When it got down to the testing in the Windows Insider Program, the Redmond firm was not strict.
Microsoft has begun removing unsuitable PCs out of the Windows Insider Program’s Dev channel. If you are in the Dev channel and your CPU is not on the assisted list, you will probably have to revert to Windows 10 to continue receiving updates.