Apex domains cannot have CNAME records.
Question and response
Question
dig augure.com. NS
Answer
augure.com. 4 NS ns-168.awsdns-21.com.
augure.com. 4 NS ns-1043.awsdns-02.org.
augure.com. 4 NS ns-793.awsdns-35.net.
augure.com. 4 NS ns-1959.awsdns-52.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0