Apex domains cannot have CNAME records.
Question and response
Question
dig msgapp.com. NS
Answer
msgapp.com. 1 NS ns-1686.awsdns-18.co.uk.
msgapp.com. 1 NS ns-911.awsdns-49.net.
msgapp.com. 1 NS ns-9.awsdns-01.com.
msgapp.com. 1 NS ns-1377.awsdns-44.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0