Voip application for windows phone 8.1 fails store submission

Question

A voip application with the new 8.1 architecture based on a separate process for the voip server is not accepted by the store.
Voip architecture is based on 8.1 sample: https://code.msdn.microsoft.com/windowsapps/ChatterBox-VoIP-WP81-64921ad4
Errors during submission:
3011: The package is missing RpalManifest.xml. Update it and then try again.
1028: The native API api-ms-win-core-processthreads-l1-1-2.dll:ExitProcess() isn’t allowed in assembly doubango.BackEndServerHost.exe. Update it and then try again.

Answer 1

Update.  I am currently working with the sample team to update the sample.   We found the problem to be in the way the BackEndServerHost VIsual studio 
project was created.   While we work on re-creating that from scratch, testing, and re-publishing I wanted to post what we have done so far in case anyone 
wants to move forward.
First there are a couple bugs in the sample, maybe you worked around those already in your development but in case not here they are.
In the backendaudio.cpp BackEndCapture::InitCapture I changed the code:
if (SUCCEEDED(hr))
WAVEFORMATEX format = {};
if (SUCCEEDED(hr))
FillPcmFormat(format, m_pwfx->nChannels, m_pwfx->nSamplesPerSec, m_pwfx->wBitsPerSample);
m_sourceFrameSizeInBytes = (format.wBitsPerSample / 8) * format.nChannels;
hr = m_pDefaultCaptureDevice->Initialize(AUDCLNT_SHAREMODE_SHARED, 0x88140000, 1000 * 10000, 0, &format, NULL);
The m_pwfx was already retrieved via GetMixFormat earlier, just use that.  Don’t create a custom one.
In the BackEndAudio::Stop routine change the order of cleanup:
if (m_pDefaultRenderDevice)
m_pDefaultRenderDevice->Release();
m_pDefaultRenderDevice = NULL;
if (m_pDefaultCaptureDevice)
m_pDefaultCaptureDevice->Release();
m_pDefaultCaptureDevice = NULL;
if (m_pCaptureClient)
m_pCaptureClient->Release();
m_pCaptureClient = NULL;
The next step is to basically delete the BackEndServerHost project and create a new one with the following steps.
1)  Add a new C++ Dirext X App (Windows Phone) to the solution and name it VoipBackendServerHost  NOTE: using "." in the name causes problems, so don't use the same name as the original sample.
2)  Remove the Common and Content Folders
3)  Remove App1Main.cpp and App1Main.h
4)  Contents of app.cpp should be:
#include "pch.h"
#include "App.h"
#include <windows.applicationmodel.core.h>
#include <wrl.h>
#include <string>
#include <stdexcept>
using namespace ABI::Windows::ApplicationModel::Core;
using namespace ABI::Windows::Foundation;
using namespace Microsoft::WRL;
using namespace Wrappers;
HRESULT __cdecl MyGetActivationFactory(_In_ HSTRING activatableClassId, _COM_Outptr_ IInspectable **factory);
class GetCustomClass : public RuntimeClass<RuntimeClassFlags<RuntimeClassType::WinRtClassicComMix>,
IGetActivationFactory,
CloakedIid<IAgileObject >>
public:
IFACEMETHODIMP GetActivationFactory(_In_ HSTRING activatableClassId, _COM_Outptr_ IInspectable **factory)
return MyGetActivationFactory(activatableClassId, factory);
private:
HMODULE m_hMod;
[Platform::MTAThread]
int main(Platform::Array<Platform::String^>^)
HRESULT hr = Initialize(RO_INIT_MULTITHREADED);
if (FAILED(hr))
throw std::runtime_error(std::string("Failed to Initialize(RO_INIT_MULTITHREADED), HRESULT: ").append(std::to_string(hr)));
// Scoping for smart pointers
ComPtr<ICoreApplication> spApplicationFactory;
hr = GetActivationFactory(HStringReference(RuntimeClass_Windows_ApplicationModel_Core_CoreApplication).Get(), &spApplicationFactory);
if (FAILED(hr))
throw std::runtime_error(std::string("Failed to GetActivationFactory(RuntimeClass_Windows_ApplicationModel_Core_CoreApplication), HRESULT: ").append(std::to_string(hr)));
ComPtr<IGetActivationFactory> spGetActivationFactory = Make<GetCustomClass>();
spApplicationFactory->RunWithActivationFactories(spGetActivationFactory.Get());
Uninitialize();
 5) Right click and bring up Project properties.  go To Linker->Input.
 6) Set the Configuration and Platform dropdowns to change all configurations all platforms at the same time
 7) Choose Edit for Additional Dependencies and set to this:
$(SolutionDir)$(PlatformTarget)\$(Configuration)\BackEnd\PhoneVoIPApp.BackEnd.lib
WindowsPhoneCore.lib
RuntimeObject.lib
 8) Under Cofniguration Properties->General Set the Target Name to PhoneVoIP.BackEnd.HostServer and Output directory to $(SolutionDir)UI
 9) APply the settings. Then click OK
10) Build the Proxy Stub
11) Build the Agents
12) Build the new Project
13) Expand the UI (Windows Phone Silverlight 8.1) Project and find the PhoneVoIP.BackEnd.HOstServer.exe and remove it.
14) Right click UI and Choose Add Existing and add the PhoneVoIP.BackEnd.HostServer
This should hopefully get you moving forward.  Please test and make sure your application is working. The end result should pass WACK now.  Please let me know if there are any issues.  It is a lot of steps and I hope I didn't miss any.
Bret Bentzinger (MSFT) @awehellyeah