Musescore 4 can't publish score from app

I keep getting this message when I try to upload this score, and I don't know why.. I can't upload it any other way because then it won't upload with the customized sound from Muse FX..

My computer won't allow screenshots right now, so here's what it says:

"Your score could not be published, please try again later or get help from this problem on musescore.org."