Apex domains cannot have CNAME records.
Question and response
Question
dig ncapp02.com. NS
Answer
ncapp02.com. 5 NS ns-1084.awsdns-07.org.
ncapp02.com. 5 NS ns-1901.awsdns-45.co.uk.
ncapp02.com. 5 NS ns-101.awsdns-12.com.
ncapp02.com. 5 NS ns-793.awsdns-35.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0