Recently I tried to activate Windows 10 Enterprise (Volume License) in VMWare Fusion, and had the following issue:
This solution worked for me:
- Enter a Command Prompt as Admininstrator.
- Run the following command (xxxx-xxxx-xxxx-xxxx – represents your product key):
slmgr.vbs -ipk xxxx-xxxx-xxxx-xxxx
Restart your computer, when you enter the Activation Screen in Settings, your product should now be activated. For more information, and troubleshooting hints, see here.