Ok so this weekend I upgraded our Datacenter host from 2008 to 2012 then to 2012 R2. Everything went fine. We are licensed for 2012 R2 , this server was originally downgraded back when we installed this to 2008 (not sure why). As a result most of the guests are 2008 R2.
Problem is this morning when I came in a few of them were saying activation failed. Just not sure what product code to use from my volume license center. Could it be AVMA screwing me up?