For Android Users.

Within the canuwork app, go to Settings and tap on Notifications.  This should show two checkboxes for turning notifications on and off.  They will show a green tick if they are on.  

You should also go into your Android Settings to ensure Notifications are turned on for the canuwork App.  Sometimes this can default to Off.

To check this, go to your Android Settings then select Notifications and then App Notifications (see below).

This will allow you to turn on (or off) notifications for each individual app.  Ensure canuwork is turned on.