Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-46.org. NS
Answer
awsdns-46.org. 5 NS g-ns-174.awsdns-46.org.
awsdns-46.org. 5 NS g-ns-1073.awsdns-46.org.
awsdns-46.org. 5 NS g-ns-752.awsdns-46.org.
awsdns-46.org. 5 NS g-ns-1646.awsdns-46.org.
Authority
The response has no authority records.
Additional
g-ns-174.awsdns-46.org. 5 A 205.251.192.174
g-ns-752.awsdns-46.org. 5 A 205.251.194.240
g-ns-1073.awsdns-46.org. 5 A 205.251.196.49
g-ns-1646.awsdns-46.org. 5 A 205.251.198.110
g-ns-174.awsdns-46.org. 5 AAAA 2600:9000:5300:ae00:0:0:0:1
g-ns-752.awsdns-46.org. 5 AAAA 2600:9000:5302:f000:0:0:0:1
g-ns-1073.awsdns-46.org. 5 AAAA 2600:9000:5304:3100:0:0:0:1
g-ns-1646.awsdns-46.org. 5 AAAA 2600:9000:5306:6e00:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0