Apex domains cannot have CNAME records.
Question and response
Question
dig elluciancloud.com. NS
Answer
elluciancloud.com. 4 NS ns-1874.awsdns-42.co.uk.
elluciancloud.com. 4 NS ns-538.awsdns-03.net.
elluciancloud.com. 4 NS ns-421.awsdns-52.com.
elluciancloud.com. 4 NS ns-1264.awsdns-30.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0