I have a service that runs a python script to create MMPKs. If I run this service as my account, it runs fine; however, when I run the service as Local System account, it fails with the error : Error Info: ERROR 999999: Error executing function. Failed to execute (CreateMobileMapPackage). I had a similar issue in ArcGIS PRO 1.4, but once I opened PRO using SYSTEM, and set the license, it created the registry settings, and then ran fine. I did the same exact thing with PRO 2.0, but it still fails.