There are many reasons why your ExpressVPN app is not working, and you need to test it to see if it works effectively. If it’s not working, you can check to see if your internet is working properly. Alternatively, you can switch servers and protocols or check to see if you’ve disabled your firewall, anti-virus, etc. Sometimes these can restrict certain websites from opening up. You could also update your app if it’s old or contact support to ask further questions.