Apex domains cannot have CNAME records.
Question and response
Question
dig naturalsolutionsdemo.com. NS
Answer
naturalsolutionsdemo.com. 5 NS ns1.naturalsolutionsdemo.com.
naturalsolutionsdemo.com. 5 NS ns2.naturalsolutionsdemo.com.
Authority
The response has no authority records.
Additional
ns1.naturalsolutionsdemo.com. 5 A 66.70.133.113
ns2.naturalsolutionsdemo.com. 5 A 51.77.100.180
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0