Hi @Michele DuBose ,
I'm glad to hear you solve the problem ,if you have any issue about SharePoint, you are welcome to raise a ticket in this forum.
By the way, since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others.". and according to the scenario introduced here: Answering your own questions on Microsoft Q&A, I would make a brief summary of this thread:
[Update user display name in SharePoint Server 2016]
Issue Symptom:
I have users who have changed departments. In AD, the user's display name displays the new department name. However, in SharePoint, the user's display name is displaying their old department name. What is the best solution without running code to update the display name in SharePoint?
Current status:
The issue is resolved. The department was not checked in the User Profile Service synchronization connection. Once I'd updated the synchronization connection to include the new department, the display name was corrected.
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