I missed the replies to my question. Thanks to all for the suggestions.
I initially got it to work vi a script and then it appears Microsoft relaxed their policy and I got in through normal measures.
Tried everything I could think of. Clean install, reset, new microsoft account, unlink and re-enroll to Inisder and still, always the Release with no other option.
Yes that chart says otherwise but I had two installs on Beta characterised by the Mustard column and both were moved to Release.
Others seem to have that experience too.
I think I misled you. The issue is that Microsoft isn't allowing MOST incompatible computers to enroll in anything save for Release. I wanted a workaround so that I have the Dev and Beta options. I think I now have that but only a new build would prove that true... or not.