Windows Server 2012 R2 Standard Build 9600 Product Key Activation Access

Check if activation was successful by typing: slmgr /xpr (shows expiration date) or slmgr /dlv (displays detailed license info). Method 3: Activating from Evaluation Edition

Press Win + X and select or Windows PowerShell (Admin) . Check if activation was successful by typing: slmgr

How to activate Windows Server using a Windows Server license? Check if activation was successful by typing: slmgr