Apex domains cannot have CNAME records.
Question and response
Question
dig tuecpa.com. NS
Answer
tuecpa.com. 5 NS ns-1273.awsdns-31.org.
tuecpa.com. 5 NS ns-541.awsdns-03.net.
tuecpa.com. 5 NS ns-517.awsdns-00.net.
tuecpa.com. 5 NS ns-1698.awsdns-20.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0