Apex domains cannot have CNAME records.
Question and response
Question
dig odmad.quest-on-demand.com. NS
Answer
odmad.quest-on-demand.com. 5 NS ns-1911.awsdns-46.co.uk.
odmad.quest-on-demand.com. 5 NS ns-259.awsdns-32.com.
odmad.quest-on-demand.com. 5 NS ns-897.awsdns-48.net.
odmad.quest-on-demand.com. 5 NS ns-1308.awsdns-35.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0