I ran into this issue as well. If you have a digital license key which you most likely do then you need to get an ISO for windows 10 and reinstall the OS, this will reactivate windows. Fully complete the initial "out-of-box" set up while connected to the internet (so it can connect to the Microsoft servers and activate the digital license). When you get to the desktop for the first time is when your digital key will be activated, you don't need to worry about preforming all of the windows updates before you image. From there you can go ahead and image it. I would recommend setting your answer file to shutdown rather than restart after the image is complete. Make sure when you power the PC back on it is connected to the internet via ethernet cable or the digital key will not activate.