My KMS server is running on Windows Server 2012 R2 and activated by Server 2012 KMS Key.
I would like to use the KMS server to activate many Windows 2008 R2 server, however, Error message "0xC004F050 The software licensing service reported that the product key is invalid" is appear when adding Windows Server 2008R2 KMS Key. The Windows
Server 2008 R2 KMS key is confirmed and validated by Microsoft Telephone service.
Command used:
slmgr /ipk<Windows Server 2008 R2 KMS Key>
Anyone can help? thanks.