If the website is not public, login is required to read the page, the usual setting for an intranet. Make the setting under Page properties -> Permissions. Untick Page is public.
This means that all users need permission, even those that should only read on the website.
It can be solved in different ways:
The user must log in to be able to read.
This also means that the templates, image archive, and file archive are not public, unless you change the permissions on those items. In order for users to access these items, a good tip is to post All authenticated users or the entire root in the directory service (where all users are located) and then grant them permissions on those items.
The page published: 2019-02-01