Apex domains cannot have CNAME records.
Question and response
Question
dig actuatortester.com. NS
Answer
actuatortester.com. 3 NS ns-837.awsdns-40.net.
actuatortester.com. 3 NS ns-285.awsdns-35.com.
actuatortester.com. 3 NS ns-1100.awsdns-09.org.
actuatortester.com. 3 NS ns-847.awsdns-41.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0