Apex domains cannot have CNAME records.
Question and response
Question
dig zylavinta.com. NS
Answer
zylavinta.com. 5 NS ns-607.awsdns-11.net.
zylavinta.com. 5 NS ns-201.awsdns-25.com.
zylavinta.com. 5 NS ns-1789.awsdns-31.co.uk.
zylavinta.com. 5 NS ns-1270.awsdns-30.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0