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Some trouble syncing some users
We set up AAD a few weeks back and created an OU called ActiveSyncUsers. We set it up such that if we add a user to that group, they will be sync'd. So far so good. We created some new users, and ...
Hi,
In addition to the article Duplicate or invalid attributes prevent directory synchronization in Office 365
You need to review your AD Sync configuration and make sure that you've don't have any other object that using for this user, for example, it can be object that is using ObjectGUID as the anchor attribute an and not email address.
Also, make sure that you don't have secondary value for another object such as a deleted object, disable object or even smtp for a secondary object.
Eli.