If when you tap the export icon, the MusicXML option is greyed, the reason is one of the following:
You don’t have the Professional level subscription. Without a subscription or with the Productivity subscription, MusicXML export is not available
The music you are trying to export as MusicXML was scanned before you took out a Productivity subscription. To remedy this, tap the gearwheel and then tap the recycle symbol. Once your music is rebuilt, you will be able to export as MusicXML
