Apex domains cannot have CNAME records.
Question and response
Question
dig void.it. NS
Answer
void.it. 2 NS dns17.ovh.net.
void.it. 2 NS ns17.ovh.net.
Authority
The response has no authority records.
Additional
ns17.ovh.net. 2 A 5.39.116.57
dns17.ovh.net. 2 A 5.135.112.105
ns17.ovh.net. 2 AAAA 2001:41d0:b00:f000:0:0:0:2
dns17.ovh.net. 2 AAAA 2001:41d0:d00:f600:0:0:0:2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0