Apex domains cannot have CNAME records.
Question and response
Question
dig tvglobo.com.br. NS
Answer
tvglobo.com.br. 3 NS ns01.oghost.com.br.
tvglobo.com.br. 3 NS ns02.oghost.com.br.
tvglobo.com.br. 3 NS ns03.oghost.com.br.
tvglobo.com.br. 3 NS ns04.oghost.com.br.
Authority
The response has no authority records.
Additional
ns01.oghost.com.br. 3 A 131.0.24.26
ns02.oghost.com.br. 3 A 186.192.89.18
ns03.oghost.com.br. 3 A 186.192.89.5
ns04.oghost.com.br. 3 A 177.53.95.213
ns01.oghost.com.br. 3 AAAA 2804:294:100:803:131:0:24:26
ns02.oghost.com.br. 5 AAAA 2804:294:4000:8003:186:192:89:18
ns03.oghost.com.br. 3 AAAA 2804:294:4000:8001:0:0:0:5
ns04.oghost.com.br. 3 AAAA 2804:294:8000:200:177:53:95:213
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0