The port on the Powerport does work, it can recharge a non-PD tablet wanting 5V 2A, and one wanting 5V 3A so its output'ing. I suspect its a comptability issue, which plaqued Anker's PD products 2017
The Powerport 5 USB-C (non PD) does not charge the 5V 3A tablet, but the Choetech one does.
The Choetech USB-C cable does work with the Powerport5-C but my new today Anker Powerline II cable does not.
All very hit'n'miss, seems random luck of combinations.