Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-08.org. NS
Answer
awsdns-08.org. 5 NS g-ns-136.awsdns-08.org.
awsdns-08.org. 5 NS g-ns-1608.awsdns-08.org.
awsdns-08.org. 5 NS g-ns-1035.awsdns-08.org.
awsdns-08.org. 5 NS g-ns-714.awsdns-08.org.
Authority
The response has no authority records.
Additional
g-ns-136.awsdns-08.org. 5 A 205.251.192.136
g-ns-714.awsdns-08.org. 5 A 205.251.194.202
g-ns-1035.awsdns-08.org. 5 A 205.251.196.11
g-ns-1608.awsdns-08.org. 5 A 205.251.198.72
g-ns-136.awsdns-08.org. 5 AAAA 2600:9000:5300:8800:0:0:0:1
g-ns-714.awsdns-08.org. 5 AAAA 2600:9000:5302:ca00:0:0:0:1
g-ns-1035.awsdns-08.org. 5 AAAA 2600:9000:5304:b00:0:0:0:1
g-ns-1608.awsdns-08.org. 5 AAAA 2600:9000:5306:4800:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0