I tried using the workstation key from the product.ini file in a Hyper V windows 10 pro machine and it seemed to accept the product key, but when I look at the system about information, it still says Windows 10 Pro, not Workstation. The last product key it shows as being entered is not the one I got from the product.ini file.
I suspect the issue is that I just created the machine from an ISO without having a separate Windows 10 Pro license for the virtual machine.
Any thoughts?