Apex domains cannot have CNAME records.
Question and response
Question
dig onsolve.net. NS
Answer
onsolve.net. 1 NS ns-1579.awsdns-05.co.uk.
onsolve.net. 1 NS ns-1086.awsdns-07.org.
onsolve.net. 1 NS ns-75.awsdns-09.com.
onsolve.net. 1 NS ns-973.awsdns-57.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0