Apex domains cannot have CNAME records.
Question and response
Question
dig bubtaa.org. NS
Answer
bubtaa.org. 5 NS ns-28.awsdns-03.com.
bubtaa.org. 5 NS ns-1424.awsdns-50.org.
bubtaa.org. 5 NS ns-583.awsdns-08.net.
bubtaa.org. 5 NS ns-349.awsdns-43.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0