Apex domains cannot have CNAME records.
Question and response
Question
dig mapmo.org. NS
Answer
mapmo.org. 2 NS ns-773.awsdns-32.net.
mapmo.org. 2 NS ns-1437.awsdns-51.org.
mapmo.org. 2 NS ns-1526.awsdns-62.org.
mapmo.org. 2 NS ns-1664.awsdns-16.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0