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Hello, thank you for reaching out to Microsoft Q&A.
May I please know which audio output device is selected as the default in the System Sound settings?
Go to Start > Settings > System > Sounds > Choose your default audio output device.
Make sure your headphones are selected.
If your headphones aren't in the lists,
Go to Start > Settings > System > Troubleshoot > Other troubleshooter> Bluetooth and select Run.
Once the troubleshooter is finished running, restart your computer and pair your headphones again.
Another method,
- Disconnect/remove your headphones from the Bluetooth devices list.
- Then go to Device Manager and expand the Bluetooth section.
- Right-click your generic Bluetooth driver, such as Realtek (R) or Intel Bluetooth driver, select Uninstall device > Select 'Attempt to remove the driver software for this device' check box, and click Uninstall.
- Once uninstalled, restart your computer and pair your Bluetooth headphones.
- Set it as the default audio output device.
See if it is working.