There's a lot to the setup of Xbox Live functionality, but as far as I can tell, I've done everything I need to. I have created the achievements for the game (they even show up in the guide while I'm playing). I have followed everything on the "Adding Xbox Live Support" page. I have properly set the Title ID and Service Configuration ID in the UWP Settings in my project. But the behavior I'm getting is very odd. For starters, the game won't even start if no one is logged in - it should start then bring up the account picker screen, but it doesn't do that. And during gameplay, no account information can be gathered. The xboxlive_user_is_signed_in() function ALWAYS returns false, even though the game won't run without someone signed in. The xboxlive_gamertag_for_user() function always returns an empty string, even though, again, the game won't run without someone signed in. If I sign out during the game, it instantly shuts down. Has anyone seen this behavior before? Does anyone have any suggestions? Thanks in advance.