Apex domains cannot have CNAME records.
Question and response
Question
dig mspmanager.com. NS
Answer
mspmanager.com. 1 NS ns-1128.awsdns-13.org.
mspmanager.com. 1 NS ns-1614.awsdns-09.co.uk.
mspmanager.com. 1 NS ns-456.awsdns-57.com.
mspmanager.com. 1 NS ns-585.awsdns-09.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0