Apex domains cannot have CNAME records.
Question and response
Question
dig me-south-1.compute.amazonaws.com. NS
Answer
me-south-1.compute.amazonaws.com. 4 NS ns-1226.awsdns-25.org.
me-south-1.compute.amazonaws.com. 4 NS ns-1836.awsdns-37.co.uk.
me-south-1.compute.amazonaws.com. 4 NS ns-232.awsdns-29.com.
me-south-1.compute.amazonaws.com. 4 NS ns-931.awsdns-52.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0