Unity AR Foundation: Raycast to instantiated objects

Unity Engine
1

Hi,
I did the AR Foundation tutorial

Instead of the plane I have a small village and now I would like to click on the individual houses with a Raycast to get the names of it.
Unfortunately this does not work for me. I have BoxCollider around my houses and Unity also has no error message.
I also found this video

and rebuilt it with Vuforia and it works here. Does this not work here with ARFoundation?

This is the code:

    private Text label;
    private GameObject bg_label;

    // Use this for initialization
    void Start()
    {
        label = GameObject.Find("LabelName").GetComponent<Text>();
        label.text = "";

        bg_label = GameObject.Find("BgLabel");
        bg_label.SetActive(false);
    }

    // Update is called once per frame
    void Update()
    {

        if ((Input.GetTouch(0).phase == TouchPhase.Stationary) || (Input.GetTouch(0).phase == TouchPhase.Moved && Input.GetTouch(0).deltaPosition.magnitude < 1.2f))
        {
            Ray ray = Camera.main.ScreenPointToRay(Input.GetTouch(0).position);
            RaycastHit hit;
            if (Physics.Raycast(ray, out hit))
            {
                bg_label.SetActive(true);
                label.text = hit.transform.name.ToString();
            }
            else
            {
                bg_label.SetActive(false);
                label.text = "";
            }
        }
    }

Thank you
Lukas

2

Same for me actually. What I know is that the touch is off by a lot. If you try to tap a GO, you have to tap it indirectly which sucks. Perhaps it has to do with the collider placements.