Only Apple based music devices show view

The following is my playground code. Any of the apple audio units show the plugin view, however anything else (i.e. kontakt, spitfire, etc.) does not. It does not error, just where the visual is expected is blank.

import AppKit
import PlaygroundSupport
import AudioToolbox
import AVFoundation
import CoreAudioKit


let manager = AVAudioUnitComponentManager.shared()

let description = AudioComponentDescription(componentType: kAudioUnitType_MusicDevice,
                                            componentSubType: 0,
                                            componentManufacturer: 0,
                                            componentFlags: 0,
                                            componentFlagsMask: 0)


var deviceComponents = manager.components(matching: description)
var names = deviceComponents.map{$0.name}

let pluginName: String = "AUSampler" // This works
//let pluginName: String = "Kontakt" // This does not
var plugin = deviceComponents.filter{$0.name.contains(pluginName)}.first!

print("Plugin name: \(plugin.name)")

var customViewController:NSViewController?

AVAudioUnit.instantiate(with: plugin.audioComponentDescription, options: []){avAudioUnit, error in
    
    var ilip = avAudioUnit!.auAudioUnit.isLoadedInProcess
    print("Loaded in process: \(ilip)")
    
    guard error == nil else {
        print("Error: \(error!.localizedDescription)")
        return
    }
    
    print("AudioUnit successfully created.")
    
    let audioUnit = avAudioUnit!.auAudioUnit
    audioUnit.requestViewController{ vc in
        
        if let viewCtrl = vc {
            customViewController = vc
            var b = vc?.view.bounds
            PlaygroundPage.current.liveView = vc
            print("Successfully added view controller.")
        }else{
            print("Failed to load controller.")
        }
    }
    
}