I am developing an application for Windows Phone 8.1 and Windows 8.1 using WinRT and the AppWarp SDK. I am trying to use the SendPrivateUpdate function to send data to another online user but for some reason I am not getting a callback on my actual devices (Nokia Lumia 1020 and Nokia Lumia 920) unless I am debugging and set a breakpoint on the OnSendPrivateUpdateDone callback. As soon as I remove the breakpoing I stop receiving the callback (I have a print statement everytime I get the callback and it never shows up). On the emulator running on my computer everything is working properly. Is there any idea on how to fix this issue?