Apex domains cannot have CNAME records.
Question and response
Question
dig us-west-2.elasticbeanstalk.com. NS
Answer
us-west-2.elasticbeanstalk.com. 5 NS ns-1927.awsdns-48.co.uk.
us-west-2.elasticbeanstalk.com. 5 NS ns-316.awsdns-39.com.
us-west-2.elasticbeanstalk.com. 5 NS ns-623.awsdns-13.net.
us-west-2.elasticbeanstalk.com. 5 NS ns-1188.awsdns-20.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0