Apex domains cannot have CNAME records.
Question and response
Question
dig phishme.com. NS
Answer
phishme.com. 1 NS ns-417.awsdns-52.com.
phishme.com. 1 NS ns-1559.awsdns-02.co.uk.
phishme.com. 1 NS ns-1054.awsdns-03.org.
phishme.com. 1 NS ns-643.awsdns-16.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0