Why is the app showing no internet connection ?
If you are seeing no internet connection constantly while other apps are working, please kill the app and switch off/on the internet connection and then relaunch.
If the above step doesn't resolve the issue, please switch off wifi and try connecting with mobile data.
If you are unable to connect, it means that your ISP is caching some old address or security certificate which is causing this issue. This is temporary and will go away on its own in 24 hours.