AWS-React: The specified key does not exist - reactjs

Question

I made one react app. My app works as expected. This app's target is practice AWS-COGNITO. For Cognito validation I am using amazon-cognito-identity-js package. I made one helper function where I validate the Congnito. and reuse it in different component. I split my Nav bar into two components. From Congnito current user I made one callback function and use it in useEffect, and dependencies put the callback function, by default getAuthenticatedUser is null. I add condition where it fetch the data, if getAuthenticatedUser then redirect to signin and signup page. I deployed my app to s3 bucket and this the link. This app runs first time, When I refresh it then got error: 404 Not Found. I really don't know what is the issue and somehow the path react path get disappear. I share my code in code-sandbox.
This is my conditional path
import React from "react";
import SigninLinks from './SigninLinks';
import SignoutLinks from './SignoutLinks';
import useHandlder from '../configHandler/useHandler';
const Nav = () => {
const { getAuthenticatedUser } = useHandlder();
const Links = getAuthenticatedUser() === null ? <SignoutLinks /> : <SigninLinks />
return (
<nav className="nav-wrapper grey darken-3">
<div className="container">
<h2 className="brand-logo">Logo</h2>
{
Links
}
</div>
</nav>
);
};
export default Nav;
This is my handler functions
import React, { useCallback, useEffect } from 'react';
import { CognitoUserPool } from 'amazon-cognito-identity-js';
const Pool_Data = {
UserPoolId: "us-east-1_9gLKIVCjP",
ClientId: "629n5o7ahjrpv6oau9reo669gv"
};
export default function useHandler() {
const userPool = new CognitoUserPool(Pool_Data)
const getAuthenticatedUser = useCallback(() => {
return userPool.getCurrentUser();
},
[],
);
useEffect(() => {
getAuthenticatedUser()
}, [getAuthenticatedUser])
const signOut = () => {
return userPool.getCurrentUser()?.signOut()
}
return {
userPool,
getAuthenticatedUser,
signOut
}
};

Answer 1

It's paths issue. You get 404 on /path not in root /. Check S3 settings for hosting static sites. On S3 make sure static website hosting is enabled:
You react app loads on /index.html JavaScript then redirects and takes over the path. You need S3 to resolve path to index.html, then it will work.