We use some AR tech for our company, and we have an AR app developed on our site that let's us call up some 3D models. I just did it this morning and it worked just fine.
When I try to call up the google AR tiger, https://arvr.google.com/scene-viewer?file=https://storage.googleapis.com/ar-answers-in-search-models/static/Tiger/model.glb&title=Tiger
It just shows the tiger on a blank canvas, and I can't put him in my environment. Google AR core is installed