You have recently installed the application on your device and when you send a test message you receive the notification but when you open it you have the error "No internet connection or server down!".

This message is due to a bug in the application (5.4 and inferior) and a change in this website to support the new release of the application.

The website has just been updated to fully support both the old versions of the application and the new one, the error should not appear anymore. I apologize for the inconvenience.