Is creating a Corner Pin animation possible?

Hello, I'm new to Adobe Premiere Pro, appx 8 months of use. After watching about a dozen tutorials and reading many posts here about using Corner Pin it just will not perform for me. 

I'm using a video clip on one track that's placed above a track with an image of a desk/workspace. I've positioned/sized the video so it looks like it's on the computer monitor in the image. Now, I want to animate the video to move off of the computer monitor in the image to a full screen size, moving one corner at a time. I can see how this would look in my mind but either Premiere Pro doesn't have that ability or I'm missing something. 

I set the keyframes for the corner point animation, corner by corner, with the starting keyframes 20 frames from the keyframes where I'd like the animation to complete but the end result is that the entire video clip displays using the last keyframe for each corner, turning the entire clip into one full screen image. No animation. I can see each corner point's width and height numbers change when I play it back, but the video doesn't change.  

I've tried every possible combination of temporal and spatial interpolation, scale to frame size, set to frame size. I've tried using several different video clips. Restarted my computer (Macbook Pro) several times set in/out points to render the effect to see if it's just an effect I cannot see. Nothing. 

I've seen the effect I'm trying to create done in tutorials on YouTube and follow them to the letter. Still, nothing. Four days of troubleshooting on this. 

I've attached a .mov screen recording of the issue I'm having. 

What am I missing? (or it is the product that has the issue?) Thanks for any advice/help.