No notification sound

Hello, please tell me. it is very important for me, why is there no sound for notifications through the browser, for example from Facebook, or other applications downloaded through Playmarket, I have sound in Windows, and I need it for work, how can I fix it?
HP Pavilion 15 32 Ram, Intel core I5.
When trying to go to the Android sound settings for a certain application, the sound does not play, what are the possible solutions?

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