HID device appear in Windows Device Manager but not listed by hidapitester #734

In that case, I advice to take a UsbTreeView tool and check what is the device descriptor structure (the way Windows sees it) first, to understand what is going on.

Thank you, I will ask for this information also.

I received the UsbTreeView results today. The screenshots for the device in question 'miniDSP SHD Series' are attached in zip file. Please let me know if you need further information for diagnostics. Thanks.
UsbTreeView Results.zip

You need to look at the top-level (Port3) for details on the USB interface you're interested in, and verify its interface class is HID class and that the HID Descriptor is present, here is an example of my Logitech BRIO:
image
Also, there supposed to be some HID details on the HID interface:
image

Thanks for the feedback I will request further details to look into it. Meanwhile, I have been spotting the differences between 'good' and 'bad' case too. One difference I noticed that the driver for the HID endpoint is handled by 'Virtual HID Minidriver Collection', rather than 'HID-compliant vendor-defined device'. Do you think that could be a reason why it is not recognized by hidapi?

No - I have not tried hidtest - I will try.