Apex domains cannot have CNAME records.
Question and response
Question
dig arthurmaiersh.com. NS
Answer
arthurmaiersh.com. 5 NS ns-140.awsdns-17.com.
arthurmaiersh.com. 5 NS ns-1914.awsdns-47.co.uk.
arthurmaiersh.com. 5 NS ns-1485.awsdns-57.org.
arthurmaiersh.com. 5 NS ns-1041.awsdns-02.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0