Apex domains cannot have CNAME records.
Question and response
Question
dig milfordnj.org. NS
Answer
milfordnj.org. 5 NS ns-1403.awsdns-47.org.
milfordnj.org. 5 NS ns-277.awsdns-34.com.
milfordnj.org. 5 NS ns-76.awsdns-09.com.
milfordnj.org. 5 NS ns-1004.awsdns-61.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0