Apex domains cannot have CNAME records.
Question and response
Question
dig desthealth.com. NS
Answer
desthealth.com. 5 NS ns-236.awsdns-29.com.
desthealth.com. 5 NS ns-869.awsdns-44.net.
desthealth.com. 5 NS ns-331.awsdns-41.com.
desthealth.com. 5 NS ns-1210.awsdns-23.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0