Apex domains cannot have CNAME records.
Question and response
Question
dig hwccustomers.com. NS
Answer
hwccustomers.com. 2 NS dns2.hwccustomers.com.
hwccustomers.com. 2 NS dns4.hwccustomers.com.
hwccustomers.com. 2 NS dns1.hwccustomers.com.
hwccustomers.com. 2 NS dns3.hwccustomers.com.
Authority
The response has no authority records.
Additional
dns1.hwccustomers.com. 2 A 23.252.205.4
dns3.hwccustomers.com. 2 A 24.238.0.111
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0