inbound.registeredsite.com has no CNAME records.
Question and response
Question
dig inbound.registeredsite.com. NS
Answer
The response has no answer records.
Authority
registeredsite.com. 1800 SOA heidi.ns.cloudflare.com. dns.cloudflare.com. 2397861954 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0