HID Report

[Waka]

I have a USB-Audio source for STM32F446MC.
I would like to add an HID and run Next Track etc.
The USB analysis tool recognises the HID descriptor, but the HID report descriptor is not recognised.
When I traced it with a debugger, I found that no USB_REQ_GET_DESCRIPTOR request was received from the host in the HID setup function.
What do you think is the cause?

[Pavel A.]

What can we think... is the HID a separate interface (as in a composite USB device)? Do you have proper HID and report descriptors for it?

[Waka]

It is a composite device of Audio and HID.
The analysis tool can confirm the IAD descriptor and HID descriptor, but the HID report descriptor cannot be recognized.
From a software perspective, I think the HID report descriptor has been set without any problems.