Apex domains cannot have CNAME records.
Question and response
Question
dig de5hkdgx2zqyc.cloudfront.net. NS
Answer
de5hkdgx2zqyc.cloudfront.net. 5 NS ns-648.awsdns-17.net.
de5hkdgx2zqyc.cloudfront.net. 5 NS ns-1820.awsdns-35.co.uk.
de5hkdgx2zqyc.cloudfront.net. 5 NS ns-23.awsdns-02.com.
de5hkdgx2zqyc.cloudfront.net. 5 NS ns-1194.awsdns-21.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0