Getting World Pose of OVR Player in Oculus Quest

I'm trying to log the world position data for my Quest headset.
The text updates correctly when testing on the editor, but when I load it onto the Quest, the world position data does not seem to update even though I am moving around in the VR environment.

Any thoughts on this would be great.

In my update method I do the following:

public GameObject VR_Rig; //set in editor to the OVR Player Controller
public Text text; //Text GUI element on Canvas under CenterEyeAnchor

void Update()
{
text.text = VR_Rig.transform.position.ToString();
}