Apex domains cannot have CNAME records.
Question and response
Question
dig acsd5.com. NS
Answer
acsd5.com. 5 NS ns-1273.awsdns-31.org.
acsd5.com. 5 NS ns-551.awsdns-04.net.
acsd5.com. 5 NS ns-445.awsdns-55.com.
acsd5.com. 5 NS ns-1811.awsdns-34.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0