Same situation for me - Running HomeAssistant OS on a Raspberry Pi. ha hardware info finds my device (a USB remote that is basically a USB keyboard but with media keys like mute, increase/decrease volume, etc instead of letters). But regardless of how I configure the keyboard_remote integration, be it via device_name or via device_descriptor, no events get fired when pressing the buttons on my remote (monitored using the Dev Tools Event Monitor with filter set to *). Using evtest on my Linux computer I can monitor the clicks, so it isn’t a hardware fault.
Cant get the event fired. Actually i found out, i CAN get it firerd via the integrated Keyboard (running HA on a Pi400). Doesnt matter if i include the Keyboard in the configuration. Yaml or not! But i need it to work with an external Keyboard. did you solve the Problem?