Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-26.com. NS
Answer
awsdns-26.com. 5 NS g-ns-27.awsdns-26.com.
awsdns-26.com. 5 NS g-ns-602.awsdns-26.com.
awsdns-26.com. 5 NS g-ns-1178.awsdns-26.com.
awsdns-26.com. 5 NS g-ns-1754.awsdns-26.com.
Authority
The response has no authority records.
Additional
g-ns-27.awsdns-26.com. 5 A 205.251.192.27
g-ns-602.awsdns-26.com. 5 A 205.251.194.90
g-ns-1178.awsdns-26.com. 5 A 205.251.196.154
g-ns-1754.awsdns-26.com. 5 A 205.251.198.218
g-ns-27.awsdns-26.com. 5 AAAA 2600:9000:5300:1b00:0:0:0:1
g-ns-602.awsdns-26.com. 5 AAAA 2600:9000:5302:5a00:0:0:0:1
g-ns-1178.awsdns-26.com. 5 AAAA 2600:9000:5304:9a00:0:0:0:1
g-ns-1754.awsdns-26.com. 5 AAAA 2600:9000:5306:da00:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0