Almost there!
Last update didn’t resolve the issue per say, still getting an error:
PATCH https://localhost/duodessonges/wp-json/wp/v2/pages/2 400 (Bad Request)
In the network pannel I’m getting
{"code":"invalid_page_template","message":"Le mod\u00e8le de page n\u2019est pas valide.","data":{"status":400}}
But the good news is that the publish button is almost working as it DOES SAVE the page, but nothing indicates that it’s working as it doesn’t quit edit mode.
Let me know if I can help ??