If your post bylines do not display an author name, you might have user and/or guest pages disabled.
Go to Authors > Settings > Users > Author Pages and make sure the Enable User Archives setting is enabled. Likewise, and only if you have the Guest Author feature enabled, go to Authors > Settings > Guest Authors > Guest Author Pages and make sure the Enable Guest Author Archives setting is also enabled.
This happen because your theme uses the get_the_author_posts_link WP core function to retrieve that information. If you want your bylines to display the author names keeping author pages disabled, please open a support ticket with us here.
