What version of MuseScore, what Operating System: Are those earbuds connected via Bluetooth?
If so, there have been multiple such reports (but IIRC no solution yet) and your's would be a duplicate.
But as far as I know, it works fine to simply go to Edit / Preferences / I/O and make sure your device is selected, possibly hit the Restart Audio and MIDI Devices button.
Comments
What version of MuseScore, what Operating System: Are those earbuds connected via Bluetooth?
If so, there have been multiple such reports (but IIRC no solution yet) and your's would be a duplicate.
See https://musescore.org/en/search/content?keys=bluetooth
But as far as I know, it works fine to simply go to Edit / Preferences / I/O and make sure your device is selected, possibly hit the Restart Audio and MIDI Devices button.