Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-44.com. NS
Answer
awsdns-44.com. 5 NS g-ns-1772.awsdns-44.com.
awsdns-44.com. 5 NS g-ns-1196.awsdns-44.com.
awsdns-44.com. 5 NS g-ns-45.awsdns-44.com.
awsdns-44.com. 5 NS g-ns-620.awsdns-44.com.
Authority
The response has no authority records.
Additional
g-ns-45.awsdns-44.com. 5 A 205.251.192.45
g-ns-620.awsdns-44.com. 5 A 205.251.194.108
g-ns-1196.awsdns-44.com. 5 A 205.251.196.172
g-ns-1772.awsdns-44.com. 5 A 205.251.198.236
g-ns-45.awsdns-44.com. 5 AAAA 2600:9000:5300:2d00:0:0:0:1
g-ns-620.awsdns-44.com. 5 AAAA 2600:9000:5302:6c00:0:0:0:1
g-ns-1196.awsdns-44.com. 5 AAAA 2600:9000:5304:ac00:0:0:0:1
g-ns-1772.awsdns-44.com. 5 AAAA 2600:9000:5306:ec00:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0