I got it working (somewhat):
Here's how:
First i setup my XBOX One as a Development Machine. I was hesitant to do this yet, I planned on doing 100% of development and testing on my Windows 10 PC via Visual Studio 2015 Update 3, but gave this a shot, and when i did following these guides:
docs.microsoft.com/en-us/window ... activation
docs.microsoft.com/en-us/window ... t-accounts
docs.microsoft.com/en-us/window ... ng-started
docs.microsoft.com/en-us/window ... ment-setup
(Links not allowed with my current rep it seems, hopefully this link is visible: pastiebin.com/5a7155c3bb3dd)
Things started working, including XBOX Live Sign-In and Gamertag retrieval. I wish Microsoft had just one article, but things are spread so broad apart that it makes things a bit more difficult to follow. That being said, setup your XBOX One console for development, then log-into your Microsoft Dev Dashboard and click on the button under your apps XBOX Live Creators Program screen labeled "Test" to propagate the changes to your xbox. Then make a new account on xbox.com for testing. Then on your XBOX Console add an existing new test account, yes the one you just made on xbox.com. Make sure its check-box is checked (enabled). Then under the Remote Access portion of the XBOX One Home app click Remote Access Settings and setup basic authentication so you can visit that portal on your development machine.
Finally, make sure you're exporting your project to the location on your hard-drive you think you are, i made a mistake and was exporting my project to ~/Desktop rather than ~/Documents, only to further confuse myself and waste time, hopefully this won't happen to you, so double-check the export path.
I also have been binding my App Store details with the generated VS Studio project every time i export the project. I noticed i needed to do this every time i export my project, maybe im doing it wrong? Who knows, but hey it works. Also make sure to uninstall and reinstall the XBOX Live nuget packages every time you export your project, i know its annoying, but it works.
Finally, select Local Debugging and it should work on your Windows Dev Machine and remotely (via Remote Debugger) on your XBOX One.
Hope this all makes sense, excuse the grammar mistakes, its late and i typed this up in a hurry.