Did you specify any other sharing rules such as ratings? Or did you pick a specific profile when you created that user, such as “teen”. This automatically places rating restrictions on the account. From your account, check the user sharing tab, select that user and view the restrictions page?
I can’t access Restrictions because I am not subscribed to Plex Pass as shown below picture, and know that I have Walt Disney movies for kids in that library and should work with any age.