We made some moves recently and had one hotdesk user that would show offline no matter what we did. We tried everything and finally tried to delete her phone and rebuild it. Now it won't let us use her username, says it already exists. We added a 1 to her username to get her by for now, but we can't change her username to the one in AD and therefore can't sync her profile with AD.
The error every time is that a DN with that username already exists, but we deleted the old phone/account out. Is there some hidden database we can purge her old account from?