Apex domains cannot have CNAME records.
Question and response
Question
dig esaas.inmoment.com. NS
Answer
esaas.inmoment.com. 5 NS ns-223.awsdns-27.com.
esaas.inmoment.com. 5 NS ns-1650.awsdns-14.co.uk.
esaas.inmoment.com. 5 NS ns-1219.awsdns-24.org.
esaas.inmoment.com. 5 NS ns-763.awsdns-31.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0