Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-08.com. NS
Answer
awsdns-08.com. 5 NS g-ns-584.awsdns-08.com.
awsdns-08.com. 5 NS g-ns-1736.awsdns-08.com.
awsdns-08.com. 5 NS g-ns-9.awsdns-08.com.
awsdns-08.com. 5 NS g-ns-1160.awsdns-08.com.
Authority
The response has no authority records.
Additional
g-ns-9.awsdns-08.com. 5 A 205.251.192.9
g-ns-584.awsdns-08.com. 5 A 205.251.194.72
g-ns-1160.awsdns-08.com. 5 A 205.251.196.136
g-ns-1736.awsdns-08.com. 5 A 205.251.198.200
g-ns-9.awsdns-08.com. 5 AAAA 2600:9000:5300:900:0:0:0:1
g-ns-584.awsdns-08.com. 5 AAAA 2600:9000:5302:4800:0:0:0:1
g-ns-1160.awsdns-08.com. 5 AAAA 2600:9000:5304:8800:0:0:0:1
g-ns-1736.awsdns-08.com. 5 AAAA 2600:9000:5306:c800:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0