Hi Jason,
According to your description, there’s no difference between a successful synced user and a failing synced user. Given this situation, I suggest you check the Event Viewer log on your DirSync server to see if there’s any error message reported regarding DirSync. Please see these steps:
1. Open the Event Viewer.
2. In the left panel, select Windows Logs-> Application. Right-click Applicationand select Create Custom View.
3. Select all that is related to DirSync for the Event sources(Directory Synchronization, FIMSynchronizationService, Windows Azure Active Directory Sync Service).
In order to protect your privacy information, please send us what you find via a private message. I’ve sent you one with the subject DirSync Event Viewer Log, and you’ll see it by clicking Private messagesunder your detailsin the upper-right of the forum page.
Thanks,
Allen