Nevermind.  Apparently, I have *exactly* 500 devices that can be found by Discover.     (I can't find a way to delete this discussion.  Guess it's here to stay.)
I know I have more devices than this, but I'm only seeing 500 in the dashboard of the free version of OpenManage Enterprise.  I can't find any documentation that verifies that this is a thing.  Is there a limit, and where is that documented?
500 device limit?