We have about 2500 windows 7 machines that use KMS. A few days ago we started to see windows, not genuine pop-up. Called Microsoft they told me the key I was using is blocked.
When I log on to the workstation I type slmgr /ato and get the error 0xC004C003
I assumed because we entered into a new year with our Volume licensing, I needed to update the 2008 r2 server with a new key. That did not fix it, so I decided it was time to upgrade the KMS server to a new server 2012r2, that has not fixed it. Still getting the same error. Any ideas?