If its the type-c version of the tablet like I have, then it will only charge using the usb type-c cable supplied in the box. I would try stick with the Anker 5V/2A charger. I’ve been successfully charging the working tablet with a iPad 5.1V/2.1A charger via the usb type-c port
haha didn’t see your reply whilst I was replying – good to know its now charging