I have added a WAF rule to skip for AS number 32934 or 63293.
I have applied the rule and when I try to scrape again the url, I still get a 404 error for page Projet Domiciliaire Albatros à St-Eustache
Was the site working with SSL prior to adding it to Cloudflare?
Double-check your SEO plugin for Facebook OpenGraph and clear the cache.
Possibly if you changed your title or URL structure, the permalink for the URL which is still being used as og:url returns 404.
I am afraid, unfortunately yes.
Setup a redirect on your web host, either via WordPress or via htaccess file.
Or, you could achieve this with Redirect Rule at Cloudflare dashboard as well.