Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-04.org. NS
Answer
awsdns-04.org. 5 NS g-ns-1604.awsdns-04.org.
awsdns-04.org. 5 NS g-ns-132.awsdns-04.org.
awsdns-04.org. 5 NS g-ns-710.awsdns-04.org.
awsdns-04.org. 5 NS g-ns-1031.awsdns-04.org.
Authority
The response has no authority records.
Additional
g-ns-132.awsdns-04.org. 5 A 205.251.192.132
g-ns-710.awsdns-04.org. 5 A 205.251.194.198
g-ns-1031.awsdns-04.org. 5 A 205.251.196.7
g-ns-1604.awsdns-04.org. 5 A 205.251.198.68
g-ns-132.awsdns-04.org. 5 AAAA 2600:9000:5300:8400:0:0:0:1
g-ns-710.awsdns-04.org. 5 AAAA 2600:9000:5302:c600:0:0:0:1
g-ns-1031.awsdns-04.org. 5 AAAA 2600:9000:5304:700:0:0:0:1
g-ns-1604.awsdns-04.org. 5 AAAA 2600:9000:5306:4400:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0