Firstly, check your notifications are enabled in preferences on SALT. Then you need to check that notifications are enabled on your phone's operating system. This will depend on your phone:
On iPhone:
- Go to Settings, then Notifications
- Find SALT and ensure notifications are enabled
- Close SALT down and reopen it
On Android:
- Go to Settings, apps, scroll to SALT
- Select Notifications, then Show notifications
- Close SALT down and reopen it