The user is unable to see 404 page when they are navigating to non-existing pages.
The user had a configuration issue and did not specify the 404 Error page.
Pre-requisites: The user must have an Administrator Rights.
- Go to Settings > Site Settings > Site Behavior.
- Click on Default Pages > select 404 Error Page.
When the user navigates to the non-existing pages, 404 page will be displayed.