Apex domains cannot have CNAME records.
Question and response
Question
dig itariannotifications.com. NS
Answer
itariannotifications.com. 4 NS ns-750.awsdns-29.net.
itariannotifications.com. 4 NS ns-1821.awsdns-35.co.uk.
itariannotifications.com. 4 NS ns-388.awsdns-48.com.
itariannotifications.com. 4 NS ns-1236.awsdns-26.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0