Thank you for the quick comment, Maybellyne…
This suggestion uncovered an issue with the robots.txt file — the file in the root of the website is not getting updated by Settings > Reading Settings in WordPress. The correct changes I made in Settings > Reading Settings was not updating the root robots.txt
Any thoughts on that?
Anyhoo, I updated the root file manually and removed Disallow: /author and still no change.
Other ideas?