AR Core failing to find planes

I am trying to set up a very simple AR Core scene for work, and for some reason the app fails to find any planes. The only type of ARRaycastHit it finds are feature points.

I have a simple scene with the ARSession and ARSessionOrigin objects, a quad for indicating the placement point, and a gameobject for holding my interaction function. (There's also a canvas with text for debug output.)

Unity version: 2018.3.0f.2
AR Foundation: 1.0.0-preview.22
ARCore XR Plugin: 1.0.0-preview.24
ARKit XR Plugin: 1.0.0-preview.27

Here's the code I'm using to locate planes and move my location indicator.

Code (CSharp):

1.  
2. using System.Collections;
3. using System.Collections.Generic;
4. using UnityEngine;
5. using UnityEngine.XR.ARFoundation;
6. using UnityEngine.Experimental.XR;
7. using System;
8. using UnityEngine.UI;
9.  
10. public class ARTapToPlaceObject : MonoBehaviour
11. {
12.     public GameObject placementIndicator;
13.     public Text debugString;
14.  
15.     private ARSessionOrigin arOrigin;
16.     private Pose placementPose;
17.     private bool placementPoseIsValid = false;
18.  
19.     // Start is called before the first frame update
20.     void Start()
21.     {
22.         arOrigin = FindObjectOfType<ARSessionOrigin>();
23.     }
24.  
25.     // Update is called once per frame
26.     void Update()
27.     {
28.         UpdatePlacementPose();
29.         UpdatePlacementIndicator();
30.     }
31.  
32.     private void UpdatePlacementPose()
33.     {
34.         var screenCenter = Camera.current.ViewportToScreenPoint(new Vector3(0.5f,0.5f));
35.         var hits = new List<ARRaycastHit>();
36.  
37.         arOrigin.Raycast(screenCenter, hits, TrackableType.All);
38.  
39.         placementPoseIsValid = hits.Count > 0;
40.  
41.         if (placementPoseIsValid)
42.         {
43.             placementPose = hits[0].pose;
44.             debugString.text = hits[0].pose.position.ToString() + ","  + hits[0].hitType;
45.         } else
46.         {
47.             debugString.text = "No valid placement surface";
48.         }
49.     }
50.  
51.     private void UpdatePlacementIndicator()
52.     {
53.         if (placementPoseIsValid)
54.         {
55.             placementIndicator.SetActive(true);
56.             placementIndicator.transform.SetPositionAndRotation(
57.                 placementPose.position, placementPose.rotation);
58.         } else
59.         {
60.             placementIndicator.SetActive(false);
61.         }
62.  
63.     }
64. }
65.  

The code works perfectly when it finds a feature point, but that's all it will find.

 

I just tried this project out with a different version of Unity and ran into the same problem. It finds feature points just fine, but cannot seem to determine where flat surfaces are.

This attempt:
Unity: 2019.1.0a12
AR Foundation: 1.1.0-preview.6
ARCore XR Plugin: 1.0.0-preview.24
ARKit XR Plugin: 1.0.0-preview.27

 

I am using:
Unity: 2019.1.0f2
AR Foundation: 2.1.0-preview.3
ARCore XR Plugin: 2.1.0-preview.5
ARKit XR Plugin: 2.1.0-preview.5

and I have exactly same problem. Any ideas on why and how to fix this?