No backing up to a snapshot etc. An in-place KMS server upgrade was performed and almost all keys are working except of course the BIGGEST one for 2012R2/Windows 10. Grabbed the key from MS Volume licensing and tried to add to the Microsoft Volume licensing activation tool (10.0.10240) and cannot for the life of me even after updates get the key to work. Key getting "invalid or a VAMT mismatch error". Not sure how this worked in 2008 and not now?
Have you guys ran into this/found a solution?