Apex domains cannot have CNAME records.
Question and response
Question
dig interactivebuy.com. NS
Answer
interactivebuy.com. 5 NS ns-2046.awsdns-63.co.uk.
interactivebuy.com. 5 NS ns-1169.awsdns-18.org.
interactivebuy.com. 5 NS ns-392.awsdns-49.com.
interactivebuy.com. 5 NS ns-1322.awsdns-37.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0