It will not work because the speaker is being used by another app, it's a normal thing and also you can't even play any videos during call. It happens in all smartphones brands.
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Thank you for sharing your concern. We acknowledge your query and apologize for the same. And please follow the easy troubleshooting steps which might help to solve the issue.
1: Set notification sound for Application, follow the below steps:
Settings >> Apps >> Tap on app >> Tap on Notifications >> Tap on a category you would like to customize >> Ensure the alerts have been enabled then tap on Sound >> Tap on a sound then press the back button to apply changes.
2: Volume setting>> Go to Settings >> Tap on Sound and vibration >> Tap on Volume >> Increase the volume.
3: 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 > Get help > Send Feedback > Error report).
Thank you for writing to us. Warm Regards, Samsung Customer Support.
