If you are not getting the notifications /reminders from your calendar,please check to see if the following settings are turned on.               
                
 ■iphone 

　1.Enable notifications/reminders from iOS settings           
　　Navigate to Settings on iPhone and Tap "Notifications" and select TimeTree           

　2.Enable notifications/reminders from inside app settings
    Tap  on "the four parallel horizontal lines" on the upper left corner         
    Tap "App settings"            
    Tap "App notifications"            
                
    3.Enable notifications/reminders from inside calendar you use            
    Tap "Settings" on the bottom right of the calendar you use            
    Tap "Settings icon" on the upper right corner          
    Tap "Receive Group Notification"            
                
・Android                

    1.Enable notifications/reminders from OS settings            
    Navigate to Settings on your iPhone            
    Select App and tap "Notifications"             
                
    2.Enable notifications/reminders from inside app settings            
    Tap four parallel horizontal lines on the upper left corner         
    Tap "App settings"            
    Tap "App notifications"            
                
    3.Enable notifications/reminders from inside calendar you use            
    Tap "Settings" on the bottom right of calendar you use            
    Tap "Settings icon" on the upper right corner               
    Tap "receive Group Notification"            
                
    Should the above suggestions not solve the problem, please follow the steps below:            
                
    4.Reinstall the app after signing in          
            
                
    5.Deactivate battery saver on OS settings            
    In case you are using system tools like Battery-Saver,please deactivate these tools temporarily.             
    Navigate to "Settings" on Android            
    Tap "Additional Settings"             
    Tap "Battery and Performance "            
                
    6.Enable notifications/reminders from OS Sound & notification screen            
    Android requires a sound to be selected for push notifications.

    To verify a sound which has been selected for push notifications.            

     Navigate to "Settings" on Android            
    Tap "Sound & Notification "             
                
    7.Re-login the app (logout and login)            
    Should the above 4-6 suggestions not solve the problem, please re-log in            
                
         
Keyword:notifications/reminders/alert