Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-35.com. NS
Answer
awsdns-35.com. 1 NS g-ns-36.awsdns-35.com.
awsdns-35.com. 1 NS g-ns-1187.awsdns-35.com.
awsdns-35.com. 1 NS g-ns-611.awsdns-35.com.
awsdns-35.com. 1 NS g-ns-1763.awsdns-35.com.
Authority
The response has no authority records.
Additional
g-ns-36.awsdns-35.com. 1 A 205.251.192.36
g-ns-611.awsdns-35.com. 1 A 205.251.194.99
g-ns-1187.awsdns-35.com. 1 A 205.251.196.163
g-ns-1763.awsdns-35.com. 1 A 205.251.198.227
g-ns-36.awsdns-35.com. 1 AAAA 2600:9000:5300:2400:0:0:0:1
g-ns-611.awsdns-35.com. 1 AAAA 2600:9000:5302:6300:0:0:0:1
g-ns-1187.awsdns-35.com. 1 AAAA 2600:9000:5304:a300:0:0:0:1
g-ns-1763.awsdns-35.com. 1 AAAA 2600:9000:5306:e300:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0