I have used an external harddrive via an aukey usb hub...Could be one of 2 things
Did you use any other things in USB C ports on MacBook Pro? If so and they worked then it may be the charger
Some have had issues with their charger and had to have it replaced at local Apple Store
when I connect this hub a green light pops up... Since there is a pass through charging port I also tried to plug in my charging cable to that port without connecting it to my macbook and the same green light pops up...