ARCore cannot detect a button hit inside the canvas

Well i have to create this augmented reality application that has a floating menu inside the main screen. I'm using the ARCore SDK from Google with Unity. Until now i have managed to create my menu and set up the ARCore camera so i can view the menu correctly while the background is rendered with the device's camera. The button therefore cannot be clicked, i have tried using RayCasting onto the button with a collider but that does not work either. I'm quite new to Unity game development, thank you.

The code that i tried is this, it works with game objects but not UI Elements.

 //Code from Google's example
 if (Input.touchCount< 1 || (touch = Input.GetTouch(0)).phase != TouchPhase.Began)
 {
     return;
 }
 //My Code
 Debug.Log("Touched");
 
 
 Ray ray = FirstPersonCamera.ScreenPointToRay(Input.GetTouch(0).position);
 RaycastHit hitObject;
 if(Physics.Raycast(ray,out hitObject, Mathf.Infinity))
 {
     Debug.Log(hitObject.transform.name);
     Debug.Log(hitObject.collider.name);
     return;
 }