Check that Home + Security app notifications are enabled on your smartphone. Note: Some Android manufacturers limit the functionality of background apps to maximize battery life. This may prevent you from receiving Home + Security notifications. For example, you can find the procedures on this link https://dontkillmyapp.com/ (Legrand Netatmo Bticino is not responsible for the content of this site) Finally, remember that even a weak Wi-Fi signal can cause notification issues.