Amplify Tutorial (Expo) and got error message on signin - react-native

Question

I'm doing this tutorial: https://docs.amplify.aws/start/getting-started/auth/q/integration/react-native#create-login-ui
I followed it completely and did everything they told me to do. The Todo works, but when I added Auth, and wrapped it. The project will start. Users can create accounts. But when you try to sign in on iOS it won't work. Strangely, when I tested it on web, users could sign in. Leading me to think it is a problem with iOS. I tested it on my iPhone with expo installed and it failed there too.
Here is a link to my issue: https://github.com/aws-amplify/amplify-js/issues/8113#issuecomment-830995508
This is my app.js
import config from './aws-exports'
Amplify.configure(config)
import { withAuthenticator } from 'aws-amplify-react-native'
import React, { useEffect, useState } from 'react'
import {
View, Text, StyleSheet, TextInput, Button
} from 'react-native'
import { API, graphqlOperation } from 'aws-amplify'
import { createTodo } from './graphql/mutations'
import { listTodos } from './graphql/queries'
const initialState = { name: '', description: '' }
const App = () => {
const [formState, setFormState] = useState(initialState)
const [todos, setTodos] = useState([])
useEffect(() => {
fetchTodos()
}, [])
function setInput(key, value) {
setFormState({ ...formState, [key]: value })
}
async function fetchTodos() {
try {
const todoData = await API.graphql(graphqlOperation(listTodos))
const todos = todoData.data.listTodos.items
setTodos(todos)
} catch (err) { console.log('error fetching todos') }
}
async function addTodo() {
try {
const todo = { ...formState }
setTodos([...todos, todo])
setFormState(initialState)
await API.graphql(graphqlOperation(createTodo, {input: todo}))
} catch (err) {
console.log('error creating todo:', err)
}
}
return (
<View style={styles.container}>
<TextInput
onChangeText={val => setInput('name', val)}
style={styles.input}
value={formState.name}
placeholder="Name"
/>
<TextInput
onChangeText={val => setInput('description', val)}
style={styles.input}
value={formState.description}
placeholder="Description"
/>
<Button title="Create Todo" onPress={addTodo} />
{
todos.map((todo, index) => (
<View key={todo.id ? todo.id : index} style={styles.todo}>
<Text style={styles.todoName}>{todo.name}</Text>
<Text>{todo.description}</Text>
</View>
))
}
</View>
)
}
const styles = StyleSheet.create({
container: { flex: 1, justifyContent: 'center', padding: 20 },
todo: { marginBottom: 15 },
input: { height: 50, backgroundColor: '#ddd', marginBottom: 10, padding: 8 },
todoName: { fontSize: 18 }
})
export default withAuthenticator(App)```
I feel like the problem might be with the ./aws-exports potentially. There was a bug where you had to move it out of src, etc. Anyone have any ideas?
[![enter image description here][1]][1]
[1]: https://i.stack.imgur.com/1Wt6J.png

Answer 1

I found out that the login error was due to a bug with expo deprecating a file. See this issue for more. https://github.com/aws-amplify/amplify-js/issues/8113#issuecomment-830995508