Acces denied to app.testproject.io

Hello, I have sent messages to the support email, my name is Leticia, I live in Nicaragua and I can not access the app project, when I try to access the site https://app.testproject.io/ shows me an access denied error, that one of the problems is the firewall, but I have no access to cloudflare, I do not know how to access without using a VPN,