Apex domains cannot have CNAME records.
Question and response
Question
dig d17ck75ga1wbos.cloudfront.net. NS
Answer
d17ck75ga1wbos.cloudfront.net. 5 NS ns-292.awsdns-36.com.
d17ck75ga1wbos.cloudfront.net. 5 NS ns-848.awsdns-42.net.
d17ck75ga1wbos.cloudfront.net. 5 NS ns-1436.awsdns-51.org.
d17ck75ga1wbos.cloudfront.net. 5 NS ns-2023.awsdns-60.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0