Apex domains cannot have CNAME records.
Question and response
Question
dig greenbaycareerpath.com. NS
Answer
greenbaycareerpath.com. 5 NS ns1.greenbaycareerpath.com.
greenbaycareerpath.com. 5 NS ns2.greenbaycareerpath.com.
Authority
The response has no authority records.
Additional
ns1.greenbaycareerpath.com. 5 A 78.135.109.141
ns2.greenbaycareerpath.com. 5 A 199.34.16.159
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0