Apex domains cannot have CNAME records.
Question and response
Question
dig herbal-provider.com. NS
Answer
herbal-provider.com. 5 NS ns-510.awsdns-63.com.
herbal-provider.com. 5 NS ns-676.awsdns-20.net.
herbal-provider.com. 5 NS ns-1814.awsdns-34.co.uk.
herbal-provider.com. 5 NS ns-488.awsdns-61.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0