Apex domains cannot have CNAME records.
Question and response
Question
dig arthurlpsh.com. NS
Answer
arthurlpsh.com. 5 NS ns-963.awsdns-56.net.
arthurlpsh.com. 5 NS ns-1790.awsdns-31.co.uk.
arthurlpsh.com. 5 NS ns-110.awsdns-13.com.
arthurlpsh.com. 5 NS ns-1563.awsdns-03.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0