Apex domains cannot have CNAME records.
Question and response
Question
dig factsmgt.com. NS
Answer
factsmgt.com. 5 NS ns-1128.awsdns-13.org.
factsmgt.com. 5 NS ns-2001.awsdns-58.co.uk.
factsmgt.com. 5 NS ns-296.awsdns-37.com.
factsmgt.com. 5 NS ns-765.awsdns-31.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0