Can anyone else not see the image?
I can unfocus my eyes a little, but what I think is mostly happening is that I’m just slightly crossing my eyes so it doesn’t work.
Crossing the eyes tends to show just the outline of the shape instead of a 3D image.
The phone screen works fine for me, but a larger screen might work better for you. It's more like a "zoning out" unfocusing than a crossing of the eyes, like you're trying to look at a point slightly behind your screen.
Is it better on a non-phone screen?