Apex domains cannot have CNAME records.
Question and response
Question
dig granpolos.com. NS
Answer
granpolos.com. 5 NS ns-1718.awsdns-22.co.uk.
granpolos.com. 5 NS ns-927.awsdns-51.net.
granpolos.com. 5 NS ns-878.awsdns-45.net.
granpolos.com. 5 NS ns-1002.awsdns-61.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0