Gotcha. Anything in the Audit Trail or Windows/Application event log from the same time? The fact it works for the local system source but not the AD domain makes me suspect it's some kind of query issue (permissions etc.) on the backend that's not reported clearly in the web UI but might have a more informative event log entry. 

No events are logged along with the message. We did find that we can enter very specific search terms and see the results of these terms. For example the search for "admin" works, and a search for "domain" works. But we can not search for "ron" or "tony" so we can not get to the accounts unless they have certain letters which we are allowed to search by.

For example since I can search for "admin" so I can also search for just "min" and find someone with a last name of "Minh"

Also I can not just select to view all. So how would I find someone with the name Ron if I can not search for the letter R O N?

Was there ever a resolution to this issue?

Think I am still waiting to hear from my last reply in November 2020. If we found a workaround I can't remember off hand, usually try to update my posts as soon as I find an answer.