UsbDevice.FromIdAsync returning null in UWP app - windows

Question

I'm currently working on an UWP app which includes USB communication with a custom USB device. I was able to set up a communication channel between a Raspberry Pi 3b and the device and sent some bytes back and forth. It does not work if I run this app on a local machine (Windows 10 build 1809) instead. In this case the call to UsbDevice.FromIdAsync always returns NULL.
I saw some related questions here, here and here with the similar or even the same problem. But none of the solutions mentioned are working for me.
I installed the Win USB driver using following inf-file:
;
; Installs WinUsb
;
[Version]
Signature = "$Windows NT$"
Class = USBDevice
ClassGUID = {88BAE032-5A81-49f0-BC3D-A4FF138216D6}
Provider = %ManufacturerName%
CatalogFile = WinUSBInstallation.cat
DriverVer = 12/12/2016,13.54.20.543
[Generic.Section.NTamd64]
%USB\MS_COMP_WINUSB.DeviceDesc% = WINUSB,USB\MS_COMP_WINUSB
; ========== Manufacturer/Models sections ===========
[Manufacturer]
%ManufacturerName% = Standard,NTamd64
[Standard.NTamd64]
%DeviceName% = USB_Install, USB\VID_0483&PID_0001
; ========== Class definition ===========
[ClassInstall32]
AddReg = ClassInstall_AddReg
[ClassInstall_AddReg]
HKR,,,,%ClassName%
HKR,,NoInstallClass,,1
HKR,,SilentInstall,,1
HKR,,IconPath,%REG_MULTI_SZ%,"%systemroot%\system32\setupapi.dll,-20"
HKR,,LowerLogoVersion,,5.2
; =================== Installation ===================
[USB_Install]
Include = winusb.inf
Needs = WINUSB.NT
[USB_Install.Services]
Include = winusb.inf
Needs = WINUSB.NT.Services
[USB_Install.HW]
AddReg = Dev_AddReg
[Dev_AddReg]
HKR,,DeviceInterfaceGUIDs,0x10000,"{9f543223-cede-4fa3-b376-a25ce9a30e74}"
; =================== Strings ===================
[Strings]
ManufacturerName = "Manufacturer"
ClassName = "Universal Serial Bus devices"
DeviceName = "Device"
REG_MULTI_SZ = 0x00010000
The device shows up properly in the device manager without any errors.
I added the device capabilities to the Package.appxmanifest as follows:
<Capabilities>
<DeviceCapability Name="usb">
<Device Id="vidpid:0483 0001">
<Function Type="classId:ff 00 00"/>
<Function Type="name:vendorSpecific"/>
</Device>
</DeviceCapability>
</Capabilities>
And in my code I try to open the device as follows:
byte deviceClass = 0xff;
byte deviceSubclass = 0x00;
var myDevices = await Windows.Devices.Enumeration.DeviceInformation.FindAllAsync(
Windows.Devices.Usb.UsbDevice.GetDeviceClassSelector(
new Windows.Devices.Usb.UsbDeviceClass() {
ClassCode = deviceClass,
SubclassCode = deviceSubclass
}
)
);
UsbDevice device = null;
var numDevices = myDevices.Count;
foreach (var d in myDevices) {
device = await UsbDevice.FromIdAsync(d.Id);
if (device == null) {
// Device could not be found.
}
else {
// Found device.
}
}
The call to FindAllAsync does find a single device which has the correct id. But calling FromIdAsync always returns NULL. As mentioned before this all works on a Raspberry Pi 3b but not locally on my desktop machine or any other machine I tried out.
I searched for a few days now and I don't know what I'm still overlooking or missing. Any suggestions what else I can do?
Best regards