VAVA USB C Hub 9-in-1 Adapter doesn't output video

this product:

VAVA USB C Hub 9-in-1 Adapter with PD Power Delivery, 4K USB C to HDMI, USB 3.0 Ports, 1Gbps Ethernet Port, SD/TF Cards Reader for MacBook/Pro/Air and Type C Windows Laptops

connected to a Pixelbook doesn’t output video over HDMI using HDMI-USB-C cable to HP z27 monitor. Please help!