Capturing the image read by QRCode

In this app I get access to QRCode.
Reading works perfectly from the camera.

Now I am struggling to get the image that was processed by the built in QRCode reader.

I have found many hints on SO, but cannot make it work.

Here is the code I have now.
It is a bit long, I have to slit in 2 parts

I looked at:
// https://stackoverflow.com/questions/56088575/how-to-get-image-of-qr-code-after-scanning-in-swift-ios
// https://stackoverflow.com/questions/37869963/how-to-use-avcapturephotooutput

Code Block 
import UIKit
import AVFoundation
class ScannerViewController: UIViewController, AVCaptureMetadataOutputObjectsDelegate {
    fileprivate var captureSession: AVCaptureSession!		// use for QRCode reading
    fileprivate var previewLayer: AVCaptureVideoPreviewLayer!
    
    // To get the image of the QRCode
    private var photoOutputQR: AVCapturePhotoOutput!
    private var isCapturing = false
    
    override func viewDidLoad() {
        super.viewDidLoad()
        var accessGranted = false
       //  switch AVCaptureDevice.authorizationStatus(for: .video) {
// HERE TEST FOR ACCESS RIGHT. WORKS OK ;
// But is .video enough ?
        }
        
        if !accessGranted {  return }
        captureSession = AVCaptureSession()
        
        photoOutputQR = AVCapturePhotoOutput()		// IS IT THE RIGHT PLACE AND THE RIGHT THING TO DO ?
        captureSession.addOutput(photoOutputQR)   // Goal is to capture an image of QRCode once acquisition is done
        guard let videoCaptureDevice = AVCaptureDevice.default(for: .video) else { return }
        let videoInput: AVCaptureDeviceInput
        
        do {
            videoInput = try AVCaptureDeviceInput(device: videoCaptureDevice)
        } catch {  return }
        
        if (captureSession.canAddInput(videoInput)) {
            captureSession.addInput(videoInput)
        } else {
            failed()
            return
        }
        
        let metadataOutput = AVCaptureMetadataOutput()
        
        if (captureSession.canAddOutput(metadataOutput)) {
            captureSession.addOutput(metadataOutput)		// SO I have 2 output in captureSession. IS IT RIGHT ?
            
            metadataOutput.setMetadataObjectsDelegate(self, queue: DispatchQueue.main)
            metadataOutput.metadataObjectTypes = [.qr]  // For QRCode video acquisition
            
        } else {
            failed()
            return
        }
        
        previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
        previewLayer.frame = view.layer.bounds
        previewLayer.frame.origin.y += 40 
        previewLayer.frame.size.height -= 40
        previewLayer.videoGravity = .resizeAspectFill
        view.layer.addSublayer(previewLayer)
        captureSession.startRunning()
    }
    
    override func viewWillAppear(_ animated: Bool) {
        
        super.viewWillAppear(animated)
        if (captureSession?.isRunning == false) {
            captureSession.startRunning()
        }
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        
        super.viewWillDisappear(animated)
        if (captureSession?.isRunning == true) {
            captureSession.stopRunning()
        }
    }
    
    // MARK: - scan Results
    
    func metadataOutput(_ output: AVCaptureMetadataOutput, didOutput metadataObjects: [AVMetadataObject], from connection: AVCaptureConnection) {
        
        captureSession.stopRunning()
        
        if let metadataObject = metadataObjects.first {
            guard let readableObject = metadataObject as? AVMetadataMachineReadableCodeObject else { return }
            guard let stringValue = readableObject.stringValue else { return }
            AudioServicesPlaySystemSound(SystemSoundID(kSystemSoundID_Vibrate))
            found(code: stringValue)
        }
        // ### Get image - IS IT THE RIGHT PLACE TO DO IT ?
        // https://stackoverflow.com/questions/37869963/how-to-use-avcapturephotooutput
        print("Do I get here ?", isCapturing)
        let photoSettings = AVCapturePhotoSettings()
        let previewPixelType = photoSettings.availablePreviewPhotoPixelFormatTypes.first!
        print("previewPixelType", previewPixelType)
        let previewFormat = [kCVPixelBufferPixelFormatTypeKey as String: previewPixelType,
                             kCVPixelBufferWidthKey as String: 160,
                             kCVPixelBufferHeightKey as String: 160]
        photoSettings.previewPhotoFormat = previewFormat
        if !isCapturing {
            isCapturing = true
            photoOutputQR.capturePhoto(with: photoSettings, delegate: self)
        }
        dismiss(animated: true)
    }
    
}
extension ScannerViewController: AVCapturePhotoCaptureDelegate {
  
    func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) {
      
        isCapturing = false
        print("photo", photo, photo.fileDataRepresentation())
        guard let imageData = photo.fileDataRepresentation() else {
            print("Error while generating image from photo capture data.");
            return
        }
     }
 
}

I get the following print on console
Clearly photo is not loaded properly

Do I get here ? false
previewPixelType 875704422
photo <AVCapturePhoto: 0x281973a20 pts:nan 1/1 settings:uid:3 photo:{0x0} time:nan-nan> nil
Error while generating image from photo capture data.