I connected the controller, got the green light and all. I can control the drone with the controller, but I get the warning that there is no positioning and I have no video feed, just a black screen.

please mention firmware for all devices

Hi there, were you using an OTG cable connected from your RC to your mobile device? If so, try disconnecting the OTG and just use WIFI connection and see if it works.

On Android also downgrading would work, in special with an OTG connection:
4.1.14/15 and maybe a firmware donwngrade, too (.701 is mine, right now)

Hi, sir. Did you use OTG cable? I would recommend you try to reset the wifi and connect your RC with phone again. Any error message from the app?

Here we are, April of 2018, and I have this issue.  How is this not cause for a class action at this point?  This is beyond unacceptable.  Only works when linked direct to phone.  I am beyond furious.