Uber API for login page, option for Login using Facebook does not work?

I am using Uber API for my application, I am trying uber login and i am successfully logging in using uber credentials. But if i click on the Facebook login button, it does not work

I am using this url for user login

https://login.uber.com/oauth/v2/authorize?response_type=code&client_id=<CLIENT_ID>&scope=request%20profile%20history&redirect_uri=<REDIRECT_URI>.

It shows me the facebook button for login using Facebook but it doesn't work.

Uber Authentication Url with Facebook login

Solution

As i Come to know that.uber facebook login only works for mobile browser.I was trying to load login site into desktop browser or nswebview from my application, which will not work because it needs facebook integration.