Apex domains cannot have CNAME records.
Question and response
Question
dig arthur2647650sh.com. NS
Answer
arthur2647650sh.com. 4 NS ns-599.awsdns-10.net.
arthur2647650sh.com. 4 NS ns-1164.awsdns-17.org.
arthur2647650sh.com. 4 NS ns-290.awsdns-36.com.
arthur2647650sh.com. 4 NS ns-1003.awsdns-61.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0