Apex domains cannot have CNAME records.
Question and response
Question
dig itwx.com. NS
Answer
itwx.com. 5 NS ns-1778.awsdns-30.co.uk.
itwx.com. 5 NS ns-17.awsdns-02.com.
itwx.com. 5 NS ns-931.awsdns-52.net.
itwx.com. 5 NS ns-1385.awsdns-45.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0