Les 5 à 7 de l’éco-construction
Pour les professionnels du bâtiment du Rhône et de la métropole de Lyon
Publié le 15 avril 2021
The urls.py posted in the question is correct. The thing with ?preview is that it allows logged-in administrators to see pages which are not published. To be able to see the page without ?preview, you have to publish it.