Running into two issues when I try using a multi target

Hey, I'm creating an AR app. You are supposed to be able to use your (android) phone to look at a box, which then shows you the content of the box. I'm running into two issues here. It's set up as follows: I've got a directional light, ARCamera, a multi target, and a tea pot object. All in the Universal Render Pipeline. In real life I have a box resembling the multi target. So now when I open the app and look at the box with my camera, it should show the tea pot object inside the box. It worked to some degree. When looking at the box, it would show the part of the tea pot that sticks out of the box, but not the parts of the tea pot inside the box. It's being rendered, but it's not showing the entire tea pot as supposed. Issue #1: So I've been changing some settings to try and fix that, but along the way of changing these settings, it seems like I'm getting a black screen now. The app seems to be running, but the camera is completely black. How can I fix the black screen? Issue #2 (which would avoid #1): My original objective is to make it so the tea pot would be completely visible. I've got a version where the camera still works, but I can't get the tea pot to show up completely there. How would I be able to make it so that the tea pot shows up completely? Info: -Unity 2019.4.28f1 -ARCore XR Plugin 2.1.19 -Vuforia Engine AR 8.5.9 -XR Plugin Management 4.2.1 -Universal RP 7.6.0 -Gradle 5.6.4