Apex domains cannot have CNAME records.
Question and response
Question
dig nexulavorn.com. NS
Answer
nexulavorn.com. 5 NS ns-2043.awsdns-63.co.uk.
nexulavorn.com. 5 NS ns-1681.awsdns-18.co.uk.
nexulavorn.com. 5 NS ns-232.awsdns-29.com.
nexulavorn.com. 5 NS ns-2039.awsdns-62.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0