Apex domains cannot have CNAME records.
Question and response
Question
dig uk-noc.com. NS
Answer
uk-noc.com. 5 NS elly.ns.cloudflare.com.
uk-noc.com. 5 NS kyrie.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0