Apex domains cannot have CNAME records.
Question and response
Question
dig connectwise.com. NS
Answer
connectwise.com. 5 NS ns-478.awsdns-59.com.
connectwise.com. 5 NS ns-1657.awsdns-15.co.uk.
connectwise.com. 5 NS ns-1454.awsdns-53.org.
connectwise.com. 5 NS ns-788.awsdns-34.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0