Apex domains cannot have CNAME records.
Question and response
Question
dig cdgsggf.com. NS
Answer
cdgsggf.com. 5 NS ns-406.awsdns-50.com.
cdgsggf.com. 5 NS ns-1017.awsdns-63.net.
cdgsggf.com. 5 NS ns-448.awsdns-56.com.
cdgsggf.com. 5 NS ns-1887.awsdns-43.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0