Apex domains cannot have CNAME records.
Question and response
Question
dig emxgpk.com. NS
Answer
emxgpk.com. 5 NS ns-314.awsdns-39.com.
emxgpk.com. 5 NS ns-455.awsdns-56.com.
emxgpk.com. 5 NS ns-1708.awsdns-21.co.uk.
emxgpk.com. 5 NS ns-144.awsdns-18.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0