Apex domains cannot have CNAME records.
Question and response
Question
dig masivapp.com. NS
Answer
masivapp.com. 5 NS ns-83.awsdns-10.com.
masivapp.com. 5 NS ns-1016.awsdns-63.net.
masivapp.com. 5 NS ns-1435.awsdns-51.org.
masivapp.com. 5 NS ns-1981.awsdns-55.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0