Delete the CNAME that points at a name that does not exist on Cloudflare
Why it matters
A CNAME in your zone points at a name that does not resolve, so the subdomain is broken and the record is clutter. If the target later becomes available to someone else, it can also turn into a takeover risk.
The fix
- Open DNS then Records, find the CNAME and either edit its target or delete it.
Related
Scan your domain to see whether this applies to you.