Apex domains cannot have CNAME records.
Question and response
Question
dig emsd1.com. NS
Answer
emsd1.com. 5 NS ns-1131.awsdns-13.org.
emsd1.com. 5 NS ns-782.awsdns-33.net.
emsd1.com. 5 NS ns-395.awsdns-49.com.
emsd1.com. 5 NS ns-1753.awsdns-27.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0