Apex domains cannot have CNAME records.
Question and response
Question
dig tuonomegroup.com. NS
Answer
tuonomegroup.com. 1 NS ns20.tuonomeregistrar.net.
tuonomegroup.com. 1 NS ns9.tuonomeregistrar.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0