Apex domains cannot have CNAME records.
Question and response
Question
dig fnxjiciv.com. NS
Answer
fnxjiciv.com. 5 NS ns-595.awsdns-10.net.
fnxjiciv.com. 5 NS ns-1488.awsdns-58.org.
fnxjiciv.com. 5 NS ns-1841.awsdns-38.co.uk.
fnxjiciv.com. 5 NS ns-450.awsdns-56.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0