App not installing on TC75

I'm running on Win7 with VS 2015 pro U3, which includes Xamarin and EMDK. I have Xamarin Player, which works great, and I can test my app on the emulator (a Nexus 5 running KitKat; API19) set on debug and any CPU. I'm using just for testing is the default hello world app, and it is untouched.

I place the app on my own personal app gallery and attempt to download it on my TC75. Red text tells me that the app may not be compatible with this device and the app installation fails without any further information. or error reports, or troubleshooting or anything. It literally just says "Installation Failed" and download stops before it began.

What could i be doing wrong? why would this app not work on my TC75? How do I make it compatible?