Did you add the custom domain both with and without `www`?
Did you add the custom domain both with and without
www?www CNAME to point to the pages.dev instead of to the naked domain.mysite.com is your actual site? For the future:example.com, example.net and example.org are standardized as example domains, such as for use in e.g. documentation, and, like in your case if you are not actually sharing a real domain name.example.com domain, rather than squatting on someone else's domain, this is what I was suggesting:example.com and www.example.com as a custom domain on your Pages project.www.example.com is missing there, and that you have only added example.com.Add a custom domain" advice from https://developers.cloudflare.com/pages/configuration/custom-domains/, and add www.example.com (assuming example.com is your domain name).example.com and www.example.com.

