Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-35.net. NS
Answer
awsdns-35.net. 5 NS g-ns-1379.awsdns-35.net.
awsdns-35.net. 5 NS g-ns-484.awsdns-35.net.
awsdns-35.net. 5 NS g-ns-805.awsdns-35.net.
awsdns-35.net. 5 NS g-ns-1955.awsdns-35.net.
Authority
The response has no authority records.
Additional
g-ns-484.awsdns-35.net. 5 A 205.251.193.228
g-ns-805.awsdns-35.net. 5 A 205.251.195.37
g-ns-1379.awsdns-35.net. 5 A 205.251.197.99
g-ns-1955.awsdns-35.net. 5 A 205.251.199.163
g-ns-484.awsdns-35.net. 5 AAAA 2600:9000:5301:e400:0:0:0:1
g-ns-805.awsdns-35.net. 5 AAAA 2600:9000:5303:2500:0:0:0:1
g-ns-1379.awsdns-35.net. 5 AAAA 2600:9000:5305:6300:0:0:0:1
g-ns-1955.awsdns-35.net. 5 AAAA 2600:9000:5307:a300:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0