<Facebook login screen doesn't show when the login...

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Facebook login screen doesn't show when the login button is clicked
I am making an app with firebase and i would like to add the facebook login on it, the problem is that i did everything the Facebook site says, step by step, and i actually tried other ways but i cannot make it works. Well it loads a progress bar in the center and shows a facebook rectangle real quick, and then nothing happens (i am using a Xiaomi smartphone to try the app). In an emulator works (the button open facebook on Chrome to login).
As i said before i tried the way that is explained...