Muse Sound Instruments Not Playing

I am trying to use MuseScore 4 and its ability to use Muse Sounds for instruments. I have a rather long score with many instruments from MuseScore 3 that I wanted to try this with. When I imported the score, all the Muse Sounds were automatically implemented, and when I clicked on the individual notes the Muse Sound instrument played the note. However, when I attempted to to play the score back, only the MS Basic instruments played. When I changed some instruments from Muse Sound to MS Basic, they would also play, but not when I changed it back. Any way to make Muse Sound instruments play during playback?