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Invalid product key error when adding Windows Server 2012 R2 or Windows 8.1 KMS key

When you try to add the the KMS key for Windows Server 2012 R2 or Windows 8.1:

cscript %windir%\system32\slmgr.vbs /ipk [product key]

you receive the following error:

0xC004F050 The Software Licensing Service reported that the product key is invalid


The KMS server needs to be updated before the key is recognized. Follow this link, download the appropiate update and install it:

You may have to reboot the KMS server.  Try again and the key will be accepted:



  1. December 14, 2013    

    Excellent help! Thank you!

  2. June 13, 2017    

    It is very useful!!Thank you!

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