Output Midi doesn't work

With MuseScore 4 the MIDI Output doesn't work, when I connect my keyboard to the PC, Musescore detects the note that I played, but when I reproduce the sound, I listening it with PC loudspeaker, not with Keyboard ones.
This function worked well with MuseScore 3.
How can I do to resolve this problem using however the current version of MuseScore?