The software licensing service reported that the product key is invalid. Double-check for typos or ensure the key matches the "Standard" edition.

This is the most reliable method for both full and evaluation versions.

Enter your 25-character product key in the window that appears. to complete the process online. 2. Command Line Activation (

The product key for Windows Server 2012 R2 Standard Build 9600 is:

Before activating, run sfc /scannow and install the latest available update rollup for Build 9600. A healthy OS activates much more reliably.

The Software License Management tool ( slmgr.vbs ) is the most reliable method, especially for build 9600.