Apex domains cannot have CNAME records.
Question and response
Question
dig stovaevents.io. NS
Answer
stovaevents.io. 5 NS ns-134.awsdns-16.com.
stovaevents.io. 5 NS ns-1597.awsdns-07.co.uk.
stovaevents.io. 5 NS ns-1390.awsdns-45.org.
stovaevents.io. 5 NS ns-628.awsdns-14.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0