Execute the command to contact Microsoft's servers: slmgr.vbs /ato .
If you are running a Windows Server 2012 R2 Datacenter host, you can use these specific keys inside your guest VMs to enable this feature: activation windows server 2012 r2
Verify the license expiration or status by typing: slmgr.vbs /xpr or slmgr.vbs /dli . 3. Activating Volume Licenses (KMS vs. MAK) KMS and MAK Activation Scenarios for Volume Activation Execute the command to contact Microsoft's servers: slmgr