Reference articles and help to activate Windows 10 in enterprise:

https://technet.microsoft.com/en-us/itpro/windows/deploy/activate-using-key-management-service-vamt

https://support.microsoft.com/en-us/kb/3086418

To activate Windows 10 Enterprise in a Windows Server 2012 R2 environment, the following prerequisites apply:

  • You must have Windows Server 2012 R2 with the Volume Activation role installed.
  • You must have update 3058168 installed.

To activate Windows 10 Enterprise in a Windows Server 2008 R2 environment, the following prerequisites apply:

  • You must have Windows Server 2008 R2 with the Volume Activation role installed.
  • You must have update 3079821 installed.