Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-01.com. NS
Answer
awsdns-01.com. 5 NS g-ns-1729.awsdns-01.com.
awsdns-01.com. 5 NS g-ns-2.awsdns-01.com.
awsdns-01.com. 5 NS g-ns-577.awsdns-01.com.
awsdns-01.com. 5 NS g-ns-1153.awsdns-01.com.
Authority
The response has no authority records.
Additional
g-ns-2.awsdns-01.com. 5 A 205.251.192.2
g-ns-577.awsdns-01.com. 5 A 205.251.194.65
g-ns-1153.awsdns-01.com. 5 A 205.251.196.129
g-ns-1729.awsdns-01.com. 5 A 205.251.198.193
g-ns-2.awsdns-01.com. 5 AAAA 2600:9000:5300:200:0:0:0:1
g-ns-577.awsdns-01.com. 5 AAAA 2600:9000:5302:4100:0:0:0:1
g-ns-1153.awsdns-01.com. 5 AAAA 2600:9000:5304:8100:0:0:0:1
g-ns-1729.awsdns-01.com. 5 AAAA 2600:9000:5306:c100:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0