Apex domains cannot have CNAME records.
Question and response
Question
dig epsbg.com. NS
Answer
epsbg.com. 5 NS ns-1419.awsdns-49.org.
epsbg.com. 5 NS ns-2043.awsdns-63.co.uk.
epsbg.com. 5 NS ns-1257.awsdns-29.org.
epsbg.com. 5 NS ns-1785.awsdns-31.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0