If when you choose export the MusicXML option is greyed, the reason is one of the following:
You don’t have the Professional level subscription. Without a Professional subscription MusicXML export is not available
The music you are trying to export as MusicXML was scanned with a lower subscription level. To remedy this go to Document settings and tap the recycle symbol or reprocess option. Once your music is rebuilt, you will be able to export as MusicXML
