Apex domains cannot have CNAME records.
Question and response
Question
dig magentosite.cloud. NS
Answer
magentosite.cloud. 5 NS ns-1194.awsdns-21.org.
magentosite.cloud. 5 NS ns-416.awsdns-52.com.
magentosite.cloud. 5 NS ns-989.awsdns-59.net.
magentosite.cloud. 5 NS ns-2014.awsdns-59.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0