Apex domains cannot have CNAME records.
Question and response
Question
dig yieldlisting.com. NS
Answer
yieldlisting.com. 4 NS ns2.yieldlisting.com.
yieldlisting.com. 4 NS ns1.yieldlisting.com.
Authority
The response has no authority records.
Additional
ns1.yieldlisting.com. 4 A 66.181.63.163
ns2.yieldlisting.com. 4 A 15.204.177.163
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0