Apex domains cannot have CNAME records.
Question and response
Question
dig athena.ediscdns1.com. NS
Answer
athena.ediscdns1.com. 5 NS ns1.ediscdns1.com.
athena.ediscdns1.com. 5 NS ns2.ediscdns1.com.
Authority
The response has no authority records.
Additional
ns1.ediscdns1.com. 5 A 170.10.164.198
ns2.ediscdns1.com. 5 A 170.10.164.207
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0