Hi!
If I understand correctly the authors are taxonomy terms. In this case you can turn ON the “Search In Terms” option, which will look in all terms connected to the posts: https://i.imgur.com/Jmf5YkP.png
This will return posts related to terms connected to them.
The option you are using right now will return the taxonomy terms as results, not the posts related.
Best,Ernest Marcinko
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