Apex domains cannot have CNAME records.
Question and response
Question
dig mailhandlersbenefitplan.com. NS
Answer
mailhandlersbenefitplan.com. 5 NS ns1.mailhandlersbenefitplan.com.
mailhandlersbenefitplan.com. 5 NS ns2.mailhandlersbenefitplan.com.
Authority
The response has no authority records.
Additional
ns1.mailhandlersbenefitplan.com. 5 A 95.214.55.136
ns2.mailhandlersbenefitplan.com. 5 A 69.87.188.16
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0