We acknowledge your query and apologize for the same. And please follow the easy troubleshooting steps which might help to solve the issue.
Volume setting>> Go to Settings >> Tap on Sound and vibration >> Tap on Volume >> Increase the volume.
Check mute all sound option: Settings >> Tap on Accessibility >> Tap on Hearing enhancements >> Disable Mute all sounds (if enabled).
If you are unable to hear your Notification sounds, ensure you have set your Sound Mode has been set to Sound. You can check by heading into your Settings > Sounds and Vibrations > Sound Mode > Sound.
In case the issue still occurs. Please register your concern in Samsung Members Application (Open Samsung Members Application > Support> Tap on error report > Type your query > Send).
Thank you for writing to Samsung. Warm regard, Samsung customer support
