Apex domains cannot have CNAME records.
Question and response
Question
dig us-east-2.compute.amazonaws.com. NS
Answer
us-east-2.compute.amazonaws.com. 4 NS ns-1244.awsdns-27.org.
us-east-2.compute.amazonaws.com. 4 NS ns-288.awsdns-36.com.
us-east-2.compute.amazonaws.com. 4 NS ns-876.awsdns-45.net.
us-east-2.compute.amazonaws.com. 4 NS ns-1855.awsdns-39.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0