Please let me know if any further information is needed
Your pages app is not configured to serve that hostname.
Thanks for the pointer! But it seems root will no longer redirect to www. Is there a way to preserve the redirect like Netlify?
Configuration of Cloudflare pages requires,
Update: Page rule does the trick!
https://mefyi.com/* Forwarding URL (Status Code: 301 - Permanent Redirect) https://www.mefyi.com/$1