Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-08.net. NS
Answer
awsdns-08.net. 5 NS g-ns-778.awsdns-08.net.
awsdns-08.net. 5 NS g-ns-1928.awsdns-08.net.
awsdns-08.net. 5 NS g-ns-457.awsdns-08.net.
awsdns-08.net. 5 NS g-ns-1352.awsdns-08.net.
Authority
The response has no authority records.
Additional
g-ns-457.awsdns-08.net. 5 A 205.251.193.201
g-ns-778.awsdns-08.net. 5 A 205.251.195.10
g-ns-1352.awsdns-08.net. 5 A 205.251.197.72
g-ns-1928.awsdns-08.net. 5 A 205.251.199.136
g-ns-457.awsdns-08.net. 5 AAAA 2600:9000:5301:c900:0:0:0:1
g-ns-778.awsdns-08.net. 5 AAAA 2600:9000:5303:a00:0:0:0:1
g-ns-1352.awsdns-08.net. 5 AAAA 2600:9000:5305:4800:0:0:0:1
g-ns-1928.awsdns-08.net. 5 AAAA 2600:9000:5307:8800:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0