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KeyboardAvoidingView not working with Expo

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I cannot seem to get the keyboard to push the content up in my React-Native Expo app. I am testing this from the expo App by publishing it from my development machine.

Try as I might, nothing seems to push the view up when the keyboard comes into focus, is there a specific order of components, or some property I am missing; I have included the versions, the render block and the style blocks I think which are relevant.

I am using the following versions (latest);

"expo": "^29.0.0",
"react": "16.3.1",
"react-native": "https://github.com/expo/react-native/archive/sdk-29.0.0.tar.gz",

For the login page, the render code looks like the following;

 render() {
    return (
      <SafeAreaView style={styles.flexContainer}>
      <KeyboardAvoidingView
        style={styles.flexContainer}
        behavior="padding"
      >
        <Image style={styles.image} source={require('../../assets/images/backgroundWelcome.png')} role="presentation" />
        <View style={styles.container}>
          <View style={[styles.row, styles.border]}>
            <TextInput 
              placeholder='Email' 
              style={styles.input} 
              onChangeText={(input) => this.setState({email: input})} 
              value={this.state.email} 
            />
          </View>
          <View style={[styles.row, styles.border]}>
            <TextInput 
              placeholder='Password'
              style={styles.input}
              secureTextEntry={true}
              onChangeText={(input) => this.setState({password: input})}
              value={this.state.password} 
            />
          </View>

          <View style={styles.row}>
            <StyledButton callback={this.handleLogin} title='Log In'/>
          </View>

        </View>
      </KeyboardAvoidingView>
      </SafeAreaView>
    )
  }

These are the styles that are relevant;

  root: {
    flex: 1,
    alignItems: 'center',
    backgroundColor: '#fff',
  },
  flexContainer: {
    flex: 1,
  },
  container: {
    paddingHorizontal: 40,
    paddingBottom: 22,
    alignItems: 'center',
    flex: -1
  },
  row: {
    flexDirection: 'row',
    marginVertical: 10,
  },

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