Apex domains cannot have CNAME records.
Question and response
Question
dig dnspro.com.br. NS
Answer
dnspro.com.br. 5 NS cesar.ns.cloudflare.com.
dnspro.com.br. 5 NS pam.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
pam.ns.cloudflare.com. 1 A 108.162.192.138
pam.ns.cloudflare.com. 1 A 172.64.32.138
pam.ns.cloudflare.com. 1 A 173.245.58.138
cesar.ns.cloudflare.com. 1 A 108.162.195.119
cesar.ns.cloudflare.com. 1 A 162.159.44.119
cesar.ns.cloudflare.com. 1 A 172.64.35.119
pam.ns.cloudflare.com. 1 AAAA 2606:4700:50:0:0:0:adf5:3a8a
pam.ns.cloudflare.com. 1 AAAA 2803:f800:50:0:0:0:6ca2:c08a
pam.ns.cloudflare.com. 1 AAAA 2a06:98c1:50:0:0:0:ac40:208a
cesar.ns.cloudflare.com. 1 AAAA 2606:4700:58:0:0:0:a29f:2c77
cesar.ns.cloudflare.com. 1 AAAA 2803:f800:50:0:0:0:6ca2:c377
cesar.ns.cloudflare.com. 1 AAAA 2a06:98c1:50:0:0:0:ac40:2377
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0