@adjunct Welcome to the Netlify community.
You seem not to have a CNAME for your www custom subdomain, and you also seem to have DNSSEC turned on at Cloudflare, which doesn’t work with Netlify.
|==================== whois check for DNSSEC ====================
| --------------------- should be unsigned ----------------------
DNSSEC: signedDelegation
DNSSEC: unSigned
|================================================================