I've created a custom post type called "Artist of the Month," and its slug is "aotm."
In my theme, I've created a custom archive page named "archive-aotm.php." WordPress does not seem to recognize this page, loading archive.php instead. (The active template is visible using the Query Monitor plugin.) I deactivated virtually all of my plugins (except Toolset-related plugins), and still the custom page wasn't recognized.
This may be an issue with the theme, but I'm uncertain and figured I would try here first.