It appears to be a Windows limitation - I'm not an expert, but my understanding is that AMD supports all the same extensions for it (under AMD rather than Intel

It appears to be a Windows limitation - I'm not an expert, but my understanding is that AMD supports all the same extensions for it (under AMD rather than Intel branding) and it appears the Windows team is (finally) working on it. I understand that other hypervisors do support nested virt on AMD. To be fair to the Windows team, AMD in the data center / pro desktops wasn't really viable for a very long time, so its understandable that it wasn't prioritized.