A few things worth trying…
- Verify your image is a good one for image tracking. You can do so with Google’s tool: The arcoreimg tool | ARCore | Google for Developers
- Make sure in the texture settings for your image, the compression is set to User Interface 2D (RGBA).
- Create a new , don’t use the template. Do it from scratch with the most basic set-up ever to narrow down the to just image tracking.
See example Blueprint here: