Apex domains cannot have CNAME records.
Question and response
Question
dig tyyxy.org. NS
Answer
tyyxy.org. 5 NS ns-986.awsdns-59.net.
tyyxy.org. 5 NS ns-442.awsdns-55.com.
tyyxy.org. 5 NS ns-1482.awsdns-57.org.
tyyxy.org. 5 NS ns-995.awsdns-60.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0