Apex domains cannot have CNAME records.
Question and response
Question
dig nicecxone.com. NS
Answer
nicecxone.com. 5 NS ns-612.awsdns-12.net.
nicecxone.com. 5 NS ns-440.awsdns-55.com.
nicecxone.com. 5 NS ns-1901.awsdns-45.co.uk.
nicecxone.com. 5 NS ns-1402.awsdns-47.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0