I'm experiencing the same issue right out of the box. I tried it with several different machines (Mac, Windows, Pi). The receiver dongle appears to be correctly identified as a HID keyboard and mouse, but it does not seem to receive anything from the keyboard. It's fully charged, the status LEDs all appear to be doing what is expected (e.g. the transmission LED flickers when a key is pressed or when the touchpad is touched), but nothing is happening on the receiving end.