Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-26.org. NS
Answer
awsdns-26.org. 4 NS g-ns-732.awsdns-26.org.
awsdns-26.org. 4 NS g-ns-154.awsdns-26.org.
awsdns-26.org. 4 NS g-ns-1626.awsdns-26.org.
awsdns-26.org. 4 NS g-ns-1053.awsdns-26.org.
Authority
The response has no authority records.
Additional
g-ns-154.awsdns-26.org. 4 A 205.251.192.154
g-ns-732.awsdns-26.org. 4 A 205.251.194.220
g-ns-1053.awsdns-26.org. 4 A 205.251.196.29
g-ns-1626.awsdns-26.org. 4 A 205.251.198.90
g-ns-154.awsdns-26.org. 4 AAAA 2600:9000:5300:9a00:0:0:0:1
g-ns-732.awsdns-26.org. 4 AAAA 2600:9000:5302:dc00:0:0:0:1
g-ns-1053.awsdns-26.org. 4 AAAA 2600:9000:5304:1d00:0:0:0:1
g-ns-1626.awsdns-26.org. 4 AAAA 2600:9000:5306:5a00:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0