I auto patch my reference images every month, all my domain joined images use KMS and there are no issues.
I'm doing something wrong with my workgroup images, after a couple of months they won't sysprep once patched. If I try to build from the image it tells me the max number of activations are reached. On stuff that's built I can slmgr /upk and recover by adding the MAK key again. My workflow for this is obviously wrong [☹] . How is best to supply the MAK in this situation where I'm rebuilding and patching the same image every month? Ta Stuart Watret Offshore - IT Ltd
