Here is a one-liner that retrieves your original Windows product key:
(Get-WmiObject -Class "SoftwareLicensingService").OA3xOriginalProductKey
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I think that that command doesn't show any key when is a digital license. It never shows nothing on machines that were updated from Windows 7 to Windows 10.
On two different Windows 10 Pro computers (one 1809 part of a domain, the other 1803 in a workgroup) nothing displays: PS C:\Users\rnmixon> (Get-WmiObject -Class "SoftwareLicensingService").OA3xOriginalProductKey PS C:\Users\rnmixon>I re-typed the quotes in case that was the problem too.