Sysprep can't validate Windows 10 Licence

I am trying to run Sysprep on my Windows 10 partition before transferring to a new Mac but when I click to run Sysprep it shows the error ‘Sysprep can’t validate the Windows licence’. I did upgrade to windows 10 for free but used my existing product key and the computer says it is fully licensed.
I have already taken a Winclone Image (I did do this before a year ago and can’t remember any issues).

Please try it without sysprep. It may work fine.