DirectX12の初期化でID3D12Deviceのフューチャーレベルがどれを設定してもnullになる理由が知りたい

提示コードのID3D12Device* _dev = nullptr; ですが初期化がすべてnullptrになってしまいます。どうしてでしょうか？フューチャーレベルをfor文でループさせたりしましたが配列にこれ以上のレベルは存在しないようですデバッグログを表示させたりif文で分岐処理を作りましたがnullptrなのは確実見たいです。どうすればいいのでしょうか？ /// コメント部の内部のif文です
elseブロックによるエラーコードのprintf出力結果

0 887a0004

1 80070057
2 80070057
3 80070057
4 80070057
5 80070057

6 887a0004
7 887a0004
8 887a0004
9 887a0004

参考サイト: https://docs.microsoft.com/en-us/windows/win32/api/d3d12/nf-d3d12-d3d12createdevice
参考サイト２: https://docs.microsoft.com/ja-jp/windows/win32/api/combaseapi/nf-combaseapi-iid_ppv_args

※DirectX12です。
dxdiagによるスペック表示

#include <Windows.h>
#include <Winerror.h>

#include <d3d12.h>

#include <dxgi1_4.h>
#include <dxgi.h>

#include <dxgi1_5.h>
#include <dxgi1_6.h>
#include <combaseapi.h>
#include <d3dcommon.h>

#ifdef _DEBUG
#include <iostream>
#endif
#include <vector>

using namespace std;

void DebugOutputFormatString(const char* format)
//void DebugOutputFormatString(const char* format,...)
{
#ifdef _DEBUG
    va_list valist;
    va_start(valist, format);
    vprintf(format, valist);
    va_end(valist);
#endif
}

LRESULT WindowProcedure(HWND hwnd,UINT msg,WPARAM wparam,LPARAM lparam)
{
    if(msg == WM_DESTROY)
    {
        PostQuitMessage(0);
        return 0;
    }

    return DefWindowProc(hwnd,msg,wparam,lparam);

}

/*feature level 配列*/
D3D_FEATURE_LEVEL levels[] = {//10

    D3D_FEATURE_LEVEL_1_0_CORE,


  D3D_FEATURE_LEVEL_9_1,
  D3D_FEATURE_LEVEL_9_2,
  D3D_FEATURE_LEVEL_9_3,

  D3D_FEATURE_LEVEL_10_0,
  D3D_FEATURE_LEVEL_10_1,

  D3D_FEATURE_LEVEL_11_0,
  D3D_FEATURE_LEVEL_11_1,

  D3D_FEATURE_LEVEL_12_0,
  D3D_FEATURE_LEVEL_12_1

//  D3D_FEATURE_LEVEL_12_1,


};

ID3D12Device* _dev = nullptr;

IDXGIFactory6* _dxgiFactory = nullptr;
IDXGISwapChain4* _swapchain = nullptr;


#ifdef _DEBUG
int main()
{


#else 
int WINAPI WinMain(HINSTANCE,HINSTANCE,LPSTR,int)
{
#endif

    //ID3D12Device::CheckFeatureSupport();
//  CheckFeatureSupport(D3D_FEATURE_LEVEL_12_0,IID_PPV_ARGS(&_dev));
    /*フューチャーレベルを設定*/
    D3D_FEATURE_LEVEL featureLevel;
    int t = 0;
    //for(auto lv : levels)
    for(auto lv : levels)
    {

        //HRESULT h = D3D12CreateDevice(nullptr, lv, IID_PPV_ARGS(&_dev));
        //////////////////////////////////////////////////////////////////////////////////////////////////////////////////
        HRESULT h = D3D12CreateDevice(nullptr, lv, IID_PPV_ARGS(&_dev));
        //////////////////////////////////////////////////////////////////////////////////////////////////////////////////
        if ( h == S_OK)
        {
            featureLevel = lv;
            cout<<"成功です"<<std::endl;
            break;

        }else
        {
        //  printf("%ld\n",h);
            printf(" %d    %lx\n",t,h);
            t++;
        }


    }

    if(_dev == nullptr )
    {
        printf("null");
        //exit(1);
        //return -1;
    }


    /*アダプタを設定*/
    auto result = CreateDXGIFactory1(IID_PPV_ARGS(&_dxgiFactory));
    if(result != S_OK)
    {
        //return -1;
    }
    std::vector<IDXGIAdapter*> adapters;
    IDXGIAdapter* tmpAdapter = nullptr;
    for(int i = 0; _dxgiFactory->EnumAdapters(i,&tmpAdapter) != DXGI_ERROR_NOT_FOUND; i++)
    {
        adapters.push_back(tmpAdapter);
    }

    for(auto adpt : adapters)
    {
        DXGI_ADAPTER_DESC adesc = {  };
        adpt->GetDesc(&adesc);
        std::wstring strDesc = adesc.Description;
        if(strDesc.find(L"INTEL") != std::string::npos)
        {
            printf("aaaa");
            tmpAdapter = adpt;
            break;
        }

    }


    WNDCLASSEX w = {};
    w.cbSize = sizeof(WNDCLASSEX);
    w.lpfnWndProc = (WNDPROC)WindowProcedure;
    w.hInstance = GetModuleHandle(nullptr);

    RegisterClassEx(&w);

    //  RECT wrc = { 0,0,window_width,window_height };
    RECT wrc = { 0,0,100,100 };//ウインドウサイズ
    AdjustWindowRect(&wrc, WS_OVERLAPPEDWINDOW, false);//ウインドウサイズの補正

    HWND hwnd = CreateWindow(w.lpszClassName,
        TEXT("DX12テスト"),
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        wrc.right - wrc.left,
        wrc.bottom - wrc.top,
        nullptr,
        nullptr,
        w.hInstance,
        nullptr);

    ShowWindow(hwnd, SW_SHOW);

    /*コマンドキュー*/
    ID3D12CommandQueue* _cmdQueue = nullptr;

    D3D12_COMMAND_QUEUE_DESC cmdQueueDesc = { };
    cmdQueueDesc.Flags = D3D12_COMMAND_QUEUE_FLAG_NONE;
    cmdQueueDesc.NodeMask = 0;
    cmdQueueDesc.Priority = D3D12_COMMAND_QUEUE_PRIORITY_NORMAL;

    cmdQueueDesc.Type = D3D12_COMMAND_LIST_TYPE_DIRECT;
    result = _dev->CreateCommandQueue(&cmdQueueDesc, IID_PPV_ARGS(&_cmdQueue));

    DXGI_SWAP_CHAIN_DESC1 swapchainDesc = { };
    swapchainDesc.Width = (UINT)100;
    swapchainDesc.Height = (UINT)100;
    swapchainDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
    swapchainDesc.Stereo = false;
    swapchainDesc.SampleDesc.Count = 1;
    swapchainDesc.SampleDesc.Quality = 0;
    swapchainDesc.BufferUsage = DXGI_USAGE_BACK_BUFFER;
    swapchainDesc.BufferCount = 2;

    swapchainDesc.Scaling = DXGI_SCALING_STRETCH;
    swapchainDesc.SwapEffect = DXGI_SWAP_EFFECT_FLIP_DISCARD;
    swapchainDesc.AlphaMode = DXGI_ALPHA_MODE_UNSPECIFIED;
    swapchainDesc.Flags = DXGI_SWAP_CHAIN_FLAG_ALLOW_MODE_SWITCH;

    result = _dxgiFactory->CreateSwapChainForHwnd(_cmdQueue, hwnd, &swapchainDesc, nullptr, nullptr, (IDXGISwapChain1**)&_swapchain);
    if(result == S_OK)
    {
    }

    printf("S_OK\n");


    MSG msg = {  };
    while (true) {
        if (PeekMessage(&msg, nullptr, 0, 0, PM_REMOVE))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }

        if (msg.message == WM_QUIT)
        {
            break;
        }
    }

    UnregisterClass(w.lpszClassName, w.hInstance);


    //DebugOutputFormatString("show window test.");
    getchar();
    return 0;

}