Getting user playlist data from Spotify Web API fails for non-developer accounts

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I’m developing a music application that utilizes Spotify’s Web API. The functionality works fine with my own Spotify account, but I encounter issues when others attempt to access it.

Currently, here’s the code I’m working with:

import fetch from 'node-fetch';
import {onMount} from 'svelte';

let userData;
let accessToken;
let authType;
let APP_ID = 'your-client-id-here';
let AUTH_URL = 'https://accounts.spotify.com/authorize';
let CALLBACK_URL = 'http://localhost:3000/';
let USER_API_ENDPOINT = 'https://api.spotify.com/v1/me/';
let PERMISSIONS = [
    'playlist-read-private',
    'user-read-playback-state',
    'user-top-read',
    'user-read-recently-played'
];
let ENCODED_PERMISSIONS = PERMISSIONS.join('%20');

function parseUrlHash(hashString) {
    let cleanHash = hashString.substring(1);
    let urlParams = cleanHash.split('&');
    let parsedParams = urlParams.reduce((result, param) => {
        let [paramKey, paramValue] = param.split('=');
        result[paramKey] = paramValue;
        return result;
    }, {});
    return parsedParams;
}

onMount(() => {
    if (window.location.hash) {
        let {access_token, token_type} = parseUrlHash(window.location.hash);
        accessToken = access_token;
        authType = token_type;
    }
});

function startAuth() {
    window.location = `${AUTH_URL}?client_id=${APP_ID}&redirect_uri=${CALLBACK_URL}&scope=${ENCODED_PERMISSIONS}&response_type=token&show_dialog=true`;
}

function fetchUserPlaylists() {
    fetch(USER_API_ENDPOINT, {
        headers: {
            'Authorization': `${authType} ${accessToken}`
        }
    })
    .then(response => response.json())
    .then(data => {
        userData = data.items;
        console.log(data.items);
    })
    .catch(error => {
        console.error(error);
    });
}

The challenge arises when regular users without developer accounts try logging in and accessing their playlists, resulting in the error: “User not registered in the Developer Dashboard”. It appears to work only for my account since I’m the developer. What steps can I take to ensure that any Spotify user can connect their account successfully? I assumed OAuth would enable this permission granting.