Apex domains cannot have CNAME records.
Question and response
Question
dig arthurgynsh.com. NS
Answer
arthurgynsh.com. 5 NS ns-1369.awsdns-43.org.
arthurgynsh.com. 5 NS ns-1504.awsdns-60.org.
arthurgynsh.com. 5 NS ns-118.awsdns-14.com.
arthurgynsh.com. 5 NS ns-1187.awsdns-20.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0