Apex domains cannot have CNAME records.
Question and response
Question
dig coceve.com. NS
Answer
coceve.com. 5 NS ns-947.awsdns-54.net.
coceve.com. 5 NS ns-117.awsdns-14.com.
coceve.com. 5 NS ns-1695.awsdns-19.co.uk.
coceve.com. 5 NS ns-1295.awsdns-33.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0