Apex domains cannot have CNAME records.
Question and response
Question
dig unified-contact.com. NS
Answer
unified-contact.com. 5 NS ns-1471.awsdns-55.org.
unified-contact.com. 5 NS ns-557.awsdns-05.net.
unified-contact.com. 5 NS ns-232.awsdns-29.com.
unified-contact.com. 5 NS ns-1673.awsdns-17.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0