hsml.myservicedesk.com has no CNAME records.
Question and response
Question
dig hsml.myservicedesk.com. NS
Answer
The response has no answer records.
Authority
myservicedesk.com. 1800 SOA carl.ns.cloudflare.com. dns.cloudflare.com. 2396613290 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0