Hi Marrion, appreciate tour prompt feedback on the MS USB-C Travel Hub and the link that clearly demonstrates that only one external port functions at any one time and furthermore, one can't even utilize the USB-C port on the adaptor to power an external screen.
Use the Microsoft or Surface USB-C Travel Hub - Microsoft Support
I believe it would be prudent of Microsoft to include that link your kindly provided on the store page that promotes this Travel Hub as that is your actual point of sale.
Please check the following store link, it clearly makes no mention whatsoever of the minimal functions on offer in either the Overview or Tech Specs dropdowns.
Microsoft USB-C Travel Hub – Microsoft Store Australia
I believe that the MS Store misleads individuals on the capabilities of this overpriced adaptor.
Regards...disillusioned customer