Can't install to Moto X Pure (3rd gen)?

[BPM]

As far as I can tell, my phone SHOULD meet the minimum requirements.

-Android 5.0 or higher (Check, it's running 6.0 "Marshmallow")
-A 64-bit processor (Check, it has a Snapdragon 808)
-A version of Android that supports 64-bit applications (Pretty sure?)
-A graphics processor that supports OpenGL ES 3.0 or higher. (Check, it's running OpenGL ES 3.1)

The only thing I'm not 100% sure on is whether or not my phone supports 64-bit apps. I'd assume it does, given that it does have a 64-bit processor.

For point of reference, this is the US variant of the Moto X Pure/Style (XT1575).

Is there something I'm missing here?