Thanks to everyone who responded. We have found the error in our ways! We could not find a way to add users because there isn't one! All that is required is the Routine AD provisioning from SIMS.net. Our problem stemmed from having multiple email addresses in parent records that were set to “Main” – fine for SIMS – Not fine for AD. The clue was in Event Viewer, here were error messages relating to the Scheduled Task failing. Oh well, you learn something new…