Apex domains cannot have CNAME records.
Question and response
Question
dig howtocuretonsilstones.com. NS
Answer
howtocuretonsilstones.com. 5 NS ns-1455.awsdns-53.org.
howtocuretonsilstones.com. 5 NS ns-1198.awsdns-21.org.
howtocuretonsilstones.com. 5 NS ns-408.awsdns-51.com.
howtocuretonsilstones.com. 5 NS ns-736.awsdns-28.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0