Apex domains cannot have CNAME records.
Question and response
Question
dig nusiem.com. NS
Answer
nusiem.com. 2 NS ns-1976.awsdns-55.co.uk.
nusiem.com. 2 NS ns-1025.awsdns-00.org.
nusiem.com. 2 NS ns-366.awsdns-45.com.
nusiem.com. 2 NS ns-630.awsdns-14.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0