Apex domains cannot have CNAME records.
Question and response
Question
dig doxee.com. NS
Answer
doxee.com. 5 NS ns-914.awsdns-50.net.
doxee.com. 5 NS ns-1360.awsdns-42.org.
doxee.com. 5 NS ns-1673.awsdns-17.co.uk.
doxee.com. 5 NS ns-462.awsdns-57.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0