react-native pass state globally using redux

In my app, the LoginScreen(fristScreen) could login with facebook and when the user successfully login, the app receives a facebook access token and navigates to the next screen(VerifyScreen). In the VerifyScreen(secondScreen), when I click a button I want to bring the global state facebookToken and display on screen. Below is my code:

App.js

import { createStore } from 'redux'
import { Provider } from 'react-redux'
import { createDrawerNavigator, createStackNavigator, } from 'react-navigation'

const reducer = (state = '', action) => {
  switch (action.type) {
    case 'UPDATE':
            return { facebookToken: action.payload}
  }
    return state
}

const store = createStore(reducer)

class App extends Component {
  render(){
    return(

      <Provider store={store}>
        <View style=>
          <AppDrawerNavigator/>
        </View>
      </Provider> 
    )
  }
}

LoginScreen.js

import { LoginButton, AccessToken } from 'react-native-fbsdk';
import {connect} from 'react-redux'

class LoginScreen extends Component{

  <View>
            <LoginButton
              onLoginFinished={
                (error, result) => {
                  if (error) {
                    console.log("login has error: " + result.error);
                  } else if (result.isCancelled) {
                    console.log("login is cancelled.");
                  } else {
                    this.props.navigation.navigate('VerifyScreen')
                    AccessToken.getCurrentAccessToken().then(
                      (data) => {
                        this.setState({facebookToken:data.accessToken},
                    () =>  console.log('facebookToken.state',this.state.facebookToken),
//Here I am getting undefined for 'this.props.facebookToken'                        
() =>  console.log('facebookToken.props',this.props.facebookToken),
                        console.log('facebook login success!'),
                        console.log('facebook token is:',data.accessToken.toString()))
                      }
                    )
                  }
                }
              }
              onLogoutFinished={() => console.log("logout.")}/>

//I created a button to see if I could call global state. but this would give me an error "state is not defined"
<Button
            title="call global state"
            onPress={() => this.props.increaseCounter()}/>


</View>

function mapStateToProps(state) {
    return {
        facebookToken: state.facebookToken
    }
}

function mapDispatchToProps(dispatch) {
    return {
        increaseCounter: () => dispatch({ type: 'UPDATE',payload: state.facebookToken }),
    }
}

export default connect(mapStateToProps, mapDispatchToProps)(LoginScreen)

VerifyScreen.js

import React, { Component } from "react";
import {
    View,
    Text,
    StyleSheet,
    Button
} from "react-native";
import {connect} from 'react-redux'


class VerifyScreen extends Component {
    render() {
        return (
        <View>
          <Button
                  title="Get facebook Access Token"
                  onPress={()=>  
                   //I get undefined data when I console.log
         console.log(this.state.facebookToken,'this.state.facebookToken')}/>
          <Text style=>{this.props.facebookToken}</Text>
        </View>
        );
    }
}

function mapStateToProps(state) {
    return {
        facebookToken: state.facebookToken
    }
}

export default connect(mapStateToProps, null)(VerifyScreen)

const styles = StyleSheet.create({
    container: {
        flex: 1,
        alignItems: 'center',
        justifyContent: 'center'
    }
});

In my LoginScreen, when I console.log this.state.facbookToken I get the data, but when I navigate to the nextScreen(VerifyScreen) and console.log it, I get undefined.

My question: how could I call global state from the VerifyScreen? I am very new to redux so I might be doing things wrong. Any advise or comments would really help. Thanks in advance!

from react-native pass state globally using redux