Answer
Confirm the user actually has the specific projection granted that backs the missing page, rather than assuming the permission set alone covers it. Enable Debug from the user-name menu, navigate to the page in question (or a working equivalent), and check the Page Info section of the debug console for the exact projection name. Then, in the projections area, grant that exact projection to the permission set the user actually holds. After restarting Aurena, the page should now be visible; refreshing the server's Dictionary and Security caches afterward is also worth trying on a non-production environment if the page still doesn't appear.