iOS Audio QML sound is muted by hardware mute switch

import QtQuick 2.12
import QtQuick.Window 2.12
import QtMultimedia 5.8

Window {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")

    Audio {
        id: audio
        loops: Audio.Infinite
        onStatusChanged:        console.log("status = " + status)
        onError:                console.log("error = " + error + " " + errorString)
        onPlaybackStateChanged: console.log("playbackstate = " + playbackState)
        source: "qrc:/sounds/audio.mp3"
        volume: 1.0
    }
    Component.onCompleted: audio.play()
}