Apex domains cannot have CNAME records.
Question and response
Question
dig smlydlv3.net. NS
Answer
smlydlv3.net. 5 NS ns-1787.awsdns-31.co.uk.
smlydlv3.net. 5 NS ns-104.awsdns-13.com.
smlydlv3.net. 5 NS ns-680.awsdns-21.net.
smlydlv3.net. 5 NS ns-1050.awsdns-03.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0