Apex domains cannot have CNAME records.
Question and response
Question
dig zyvontira.com. NS
Answer
zyvontira.com. 2 NS ns-12.awsdns-01.com.
zyvontira.com. 2 NS ns-1373.awsdns-43.org.
zyvontira.com. 2 NS ns-1006.awsdns-61.net.
zyvontira.com. 2 NS ns-187.awsdns-23.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0