@kewin.f.c You will need a 30 W adapter to power the desktop dock.
I assume you have tried connection your phone to the dock to see if it works? If the indicator light on the dock does not light up, you should at least be able to hear the fan spinning and your phone recognizing the dock when plugged in. I noticed just now that the indicator light on my test unit does not turn on, but the dock functions fine apart from that.