No notification sounds

Hi there JosipMuzic,

Thanks for reaching out to Apple Support Communities. We understand you’ve run into an issue with Notification sounds on your Mac. We’ll be happy to help.

Do you have any Bluetooth speakers or headphones/headset connected? If so, please disconnect the audio device and test again.

If the issue continues, restart your Mac: Log out, sleep, wake, restart, or shut down your Mac.

If the issue continues, check to see if other sounds are working. You can try playing a video or music. If there is a large sound issue, follow this guide: If you can’t hear sound from your Mac speakers. We hope this helps.

Best regards.

An off topic but possibly related - you are showing Big Sur 11.2. There is an update available to 11.4. If already @ 11.4 - please disregard. It may or may not be related to your issue.

Thanks for reaching back out JosipMuzic,

Did you turn the Bluetooth headphones off? If not, that might be affecting the sounds. If this started after updating macOS, it is possible that updating to the latest version may help resolve the issue. Be sure to back up your data first. If the behavior continues, reach out to Apple Support for further assistance: Contact Apple Support.

Have a great day.

Regardless if 11.4 will fix your Sound Notification Issue - running an out-dated version of any OS including Big Sur - puts the computer at risk of malfunction, not performing as designed by Apple and other unknown issues. Good practice is the keep the OS updated. It may or may not resolve your issue.

Whatever the decision is - make A Time Machine Backup Before the update and keep it ( Time Machine ) updated often.