Hello @Icematt,
Here is an HP Document listing all types of compatible accessories for your device, including hubs like USB hubs.
Do NOT purchase any USB-C hubs with video output ports like HDMI/VGA or expect these video output ports to work when the USB-C dock is connected as the specifications indicating that the device supports DP Alt mode (required for display output from the USB-C port) is actually incorrect.
Kind regards,
Edward
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