A. Check the app's notification settings. Go to the app settings, look for 'Notifications' or 'Sound' options, and ensure that sound notifications are enabled. If there are no options available, consider using a third-party notification manager app that can help customize notifications for your apps.

B. If the app does not support sound notifications, you can set up a workaround by using a task automation app like Tasker. Create a profile that triggers a sound notification when you receive a message from the app.