Apex domains cannot have CNAME records.
Question and response
Question
dig acm-services-inc.com. NS
Answer
acm-services-inc.com. 4 NS ns-998.awsdns-60.net.
acm-services-inc.com. 4 NS ns-358.awsdns-44.com.
acm-services-inc.com. 4 NS ns-293.awsdns-36.com.
acm-services-inc.com. 4 NS ns-1436.awsdns-51.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0