Hello, thank you for reaching out to Microsoft Q&A.
May I please know the default output device selected in the system sound settings?
Go to Start > Settings > System > Sounds > Choose your output device.
If your Bluetooth speaker isn't in the list, then the device might not be connected properly.
Open the Bluetooth & Device section, remove your Bluetooth speakers from the connected devices list, and pair them again.
If you are still having issues,
1
Run the Bluetooth troubleshooter.
Go to Start > Settings > System > Troubleshoot > Other troubleshooters.
Locate Bluetooth and select Run.
Once completed, restart your computer and pair your Bluetooth device again.
2
- Disconnect/remove your Bluetooth Speakers from the list of connected Bluetooth devices.
- 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 speakers.
- Set it as the default audio output device and test your speakers.
Let me know if you still need more help.