Apex domains cannot have CNAME records.
Question and response
Question
dig cyberverse.fun. NS
Answer
cyberverse.fun. 5 NS ns-944.awsdns-54.net.
cyberverse.fun. 5 NS ns-225.awsdns-28.com.
cyberverse.fun. 5 NS ns-2029.awsdns-61.co.uk.
cyberverse.fun. 5 NS ns-1413.awsdns-48.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0