Render Target as texture fails on different devices

I have a lens that includes animated "reflections" on a pair of goggles. To do this, I am using a camera and a Render Target as a texture for the goggle glass material.

When I publish the lens and test it on different devices, the Target Render texture moves around, ruining the effect of the static sting ray "reflections." I've manually set the UV of the mesh, and the resolution of the Render Target texture.

How do I stop the shifting?

Lens Studio - Y Position and Scale are higher

Android - Y position and placement are lower (scale/position appears as desired here)

iOS - Texture doesn't appear at all