Key strokes from keyboard connected to Nucleo-F767ZI are not recognized in HID_standalone application example

[WPles.1]

I have a setup as required by the HID_standalone example program. When I am starting the program the keyboard that is connected to CN13 is properly recognized (last two sentences on the screen are:

KeyBoard device found! and

HID class started

When I then start HID, the program tells me to enter characters via that connected keyboard. Iam doing that without any response.

What is wrong?

Rgds.,

Wilfried

[WPles.1]

when trying to do that test with the controller's tech example (https://controllerstech.com/stm32-usb-host-hid/) the " USBH_HID_EventCallback" is never entered, when a key of the USB keyboard is pressed.

I have done that test with three different keyboards.