Could not verify Product Key

 Hi,

I am using VAMT 2.0.67.0 installed in Windows 2008 R2 Server.

Office KMS key installed and working fine for long time.

Now i need to add win2012 r2 KMS key.

When i try add product key, it gives error "The product key you entered is not supported. check the key and try again"

Is there any other way to update the key?

earliest reply is highly appreciated.

Thanks

Alagar