It could be because of the settings done in your device. You can change the below settings of your device in order to receive notifications.
Please go the phone's settings, look for 'Battery', click on 'Dailyhunt' app and tap on 'Power Consumption Protection' and then disable 'Background Freeze, Optimization & Doze' to receive the notifications.
Go to Phone Settings and tap on 'Battery'
OR
Phone settings>> Notification Center>>DailyHunt>>Enable all the options (Allow Notification, Display on status bar and Display on Lock screen).
Even after enabling all the above steps, if you are still not getting the notification, please write to us with your app Client ID at YourFriends@Dailyhunt.in.
Note: Client ID can be seen in the ABOUT US section.