title: React-Native-FBSDK login doesn't return email
body: <p>I'm trying to use the default &lt;'LoginButton ... > for login in the app through Facebook login, but I can't manage to get the user's email.</p>
  
  <p>This is my button:</p>
  
  <pre><code>&lt;LoginButton   
    publishPermissions={["email"]}
    onLoginFinished={
      (error, result) =&gt; {
        if (error) {
          alert("Login failed with error: " + error.message);
        } else if (result.isCancelled) {
          alert("Login was cancelled");
        } else {
          alert("Login was successful with permissions: " + result.grantedPermissions)
        }
      }
    }
   onLogoutFinished={() =&gt; alert("User logged out")}
  /&gt;
  </code></pre>
  
  <p>And this is how i try to get the user's details:</p>
  
  <pre><code>  async FBGraphRequest(fields, callback) {
      const accessData = await AccessToken.getCurrentAccessToken();
  
      console.log("token= ", accessData.accessToken )
      // Create a graph request asking for user information
      const infoRequest = new GraphRequest('/me', {
        accessToken: accessData.accessToken,
        parameters: {
          fields: {
            string: fields
          }
        }
      }, this.FBLoginCallback.bind(this));
      // Execute the graph request created above
      new GraphRequestManager().addRequest(infoRequest).start();
    }
  
    async FBLoginCallback(error, result) {
      if (error) {
        this.setState({
          showLoadingModal: false,
          notificationMessage: "facebook error"
        });
      } else {
        // Retrieve and save user details in state. In our case with 
        // Redux and custom action saveUser
        this.setState({
          id: result.id,
          email: result.email,
          name: result.name
        });
        console.log("facebook login",result)
      }
  
    }
  </code></pre>
  
  <p>The <code>console.log("facebook login",result)</code> line returns me only the account name and id, but there is no field for te email...</p>
  
  <p>What am I doing wrong?</p>
  
  <p>PS.: I've also tryed to use a "custom function", but it doesn't work too (for the email, the login worked and i get only the user details like name and id):</p>
  
  <pre><code>async facebookLogin() {
      // native_only config will fail in the case that the user has
      // not installed in his device the Facebook app. In this case we
      // need to go for webview.
      let result;
      try {
        this.setState({showLoadingModal: true});   
        LoginManager.setLoginBehavior('NATIVE_ONLY');
        result = await LoginManager.logInWithReadPermissions(['public_profile', 'email']);
      } catch (nativeError) {
        try {
          LoginManager.setLoginBehavior('WEB_ONLY');
          result = await LoginManager.logInWithReadPermissions(['email']);
        } catch (webError) {
          // show error message to the user if none of the FB screens
          // did not open
        }
      }
      console.log("facebook result 1: ", result)
      // handle the case that users clicks cancel button in Login view
      if (result.isCancelled) {
        this.setState({
          showLoadingModal: false,
          notificationMessage: I18n.t('welcome.FACEBOOK_CANCEL_LOGIN')
        });
      } else {
        // Create a graph request asking for user information
        this.FBGraphRequest('id, email, name', this.FBLoginCallback);
      }
    }
  .
  .
  .
          &lt;LoginButton   
            publishPermissions={["email"]}
            onPress={
              this.facebookLogin()
            }
            onLogoutFinished={() =&gt; alert("User logged out")}
            /&gt;
  </code></pre>
  
  <p>this are the field request by the app. I need to insert also the user's Email:
  <a href="https://i.stack.imgur.com/VCNfF.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/VCNfF.png" alt="Request from the app"></a></p>