Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-01.org. NS
Answer
awsdns-01.org. 5 NS g-ns-1601.awsdns-01.org.
awsdns-01.org. 5 NS g-ns-129.awsdns-01.org.
awsdns-01.org. 5 NS g-ns-707.awsdns-01.org.
awsdns-01.org. 5 NS g-ns-1028.awsdns-01.org.
Authority
The response has no authority records.
Additional
g-ns-129.awsdns-01.org. 5 A 205.251.192.129
g-ns-707.awsdns-01.org. 5 A 205.251.194.195
g-ns-1028.awsdns-01.org. 5 A 205.251.196.4
g-ns-1601.awsdns-01.org. 5 A 205.251.198.65
g-ns-129.awsdns-01.org. 5 AAAA 2600:9000:5300:8100:0:0:0:1
g-ns-707.awsdns-01.org. 5 AAAA 2600:9000:5302:c300:0:0:0:1
g-ns-1028.awsdns-01.org. 5 AAAA 2600:9000:5304:400:0:0:0:1
g-ns-1601.awsdns-01.org. 5 AAAA 2600:9000:5306:4100:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0