I cannot control volume over Bluetooth on a PC running Windows 10

Disable the absolute volume function on the computer by following these steps.
1. Open Windows Registry (search for regedit.exe).
2. Click on Computer>HKEY_LOCAL_MACHINE>SYSTEM>ControlSet001>Control>Bluetooth>Audio>AVRCP>CT
3. Then click on DisableAbsoluteVolume and set the value to 1