Apex domains cannot have CNAME records.
Question and response
Question
dig vismaconsulting.fi. NS
Answer
vismaconsulting.fi. 3 NS ns1.gcorelabs.net.
vismaconsulting.fi. 3 NS ns2.gcdn.services.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0