Apex domains cannot have CNAME records.
Question and response
Question
dig ninjarmm.com. NS
Answer
ninjarmm.com. 4 NS ns-1823.awsdns-35.co.uk.
ninjarmm.com. 4 NS ns-839.awsdns-40.net.
ninjarmm.com. 4 NS ns-378.awsdns-47.com.
ninjarmm.com. 4 NS ns-1159.awsdns-16.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0