Apex domains cannot have CNAME records.
Question and response
Question
dig itwxdev.com. NS
Answer
itwxdev.com. 2 NS ns-667.awsdns-19.net.
itwxdev.com. 2 NS ns-1882.awsdns-43.co.uk.
itwxdev.com. 2 NS ns-34.awsdns-04.com.
itwxdev.com. 2 NS ns-1226.awsdns-25.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0