Don't forget about the battery dilemma. Pretty sure you still need to first charge each one individually without the dock to ensure proper activation.
Edit: I'm not sure if this has been addressed or remedied by DJI yet, so I just wanted to throw that out there.
There was like one video, in German, saying that. DJI never said anything was wrong. A poster on here charged all 3 with the hub with no issues. I charged the first one stand alone, so I at least had one working, but am now charging the other 2 on the hub to see what happens.