Sorry to hear that you're running into this issue. It sounds like something may be blocking communication with our authentication servers. Are you running the app on a work computer or a home computer? It's possible that some firewall or antivirus settings are preventing the authentication from happening.
Please try disabling any firewalls or antivirus software installed on your computer to see if that fixes the problem. If not, would it be possible to connect your computer to another internet connection?