How do I properly use LayerToCanvas in 3D?

I'm trying to position a text object on a 2D layer that stays above a 3D object on the screen as the camera moves around freely. (Think player nameplates in a game, for example)

I have it working using 3DCamera.LayerToCanvas, but if the window is resized from its original viewport resolution, it messes up the positioning so it's still not quite right. I figured maybe I'm doing something wrong. What am I missing?

I made a quick example project to show what I did. Run a preview and move with the arrow keys. Resize the window and you can see the issue with the text I'm trying to solve.

https://www.dropbox.com/s/h3u9a3o455y4xe9/LayerToCanvasTest.c3p?dl=0

Any corrections or solutions are appreciated! Thanks.

I figured it out. I didn't realize that function wouldn't scale the coordinates for me. Getting the canvas size using platform info allowed me to scale it, which is what I was missing.

I'll upload the solution too in case it helps anybody else who runs into this.

dropbox.com/s/ycqrggq5mb5pfmd/LayerToCanvasTest_Solution.c3p