Inspiron 5584 / Disable "beep"' sound when increasing Bluetooth speakers volume

BIOS 1.9.2. All Windows 10 sounds are already disabled, however when I connect a pair of Bluetooth speakers there is an annoying "beep" sound whenever I increase/decrease the volume (either by using the F keys or by dragging the volume bar on the taskbar)

Please note that this "beep" is not heard when the built-in laptop speakers are used

Thanks