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#11
Pls try clean install with local account only, i.e. no ms account, and you will see your Win10 is activated automatically. So I may can say that it has nothing to do with the ms account.
I don't like this auto activate thing, some day later, I need to proof that I had a working key in case I can not activate the windows, I can NOT. and MS can just reject my request to activate over the phone or something else I don't know.
the solution i have right now is do to a acronis image after the clean install. rollback to that image in case reinstall is required in the future.