I am not using anything to control windows that I know of, other than classic shell just for the start menu. (Sorry never became a fan of the win10 start menu :down:)
None of my friends use an insider preview build, just myself.
I am logged into my Microsoft account, not local.
Followed all your instructions and let it did its thing. Once it finished I restarted my laptop and it still just states the same error.
I guess this problem would need a fresh install of the insider preview I would assume.