Initially please check these settings:
-Bluetooth needs to be turn on
-Do not disturb mode/ Airline mode must be off in your phone settings for the tracker to receive notifications. Please ensure all permissions are enabling.
For Android Devices:
Settings > Apps >Actofit Fitness > Permissions > Please turn on all of these permission
Please make sure that notifications are turned on for all of the apps that you want to receive notification from.
For Samsung Phone:
-Go to Messages > Tap menu icon looks like three dots in the top right > settings > Notifications > turn off App Badges