@Eduardo_Braga I think, you haven’t added the DNS record and have * to catch all. You can add A record for forum with the Vultr IP address
Update:
@Eduardo_Braga
The DNS is still pointing to Cloudflare - https://www.whatsmydns.net/#A/forum.meuxbox.com.br
Not sure if the A record are appended with the domain or not. Can you give the full path “forum.meuxbox.com.br” in the Name fields?
Usually, if you add the A record, atleast one server picks it up in 5-10 mins across the globe. As non of them have picked it, DNS is not mapped correctly.