NextJS - CORS No 'Access-Control-Allow-Origin' header is present on the requested resource

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Also, for further reference, here is the basic /api/auth/[auth0]/route.ts setup.

import { handleAuth, handleLogin, handleLogout } from '@auth0/nextjs-auth0';

const logoutUrl = [
  `${process.env.AUTH0_ISSUER_BASE_URL}/v2/logout?`,
  `client_id=${process.env.AUTH0_CLIENT_ID}`,
  `&returnTo=${process.env.AUTH0_BASE_URL}`,
];

export const GET = handleAuth({
  login: handleLogin({
    returnTo: '/',
  }),
  logout: handleLogout({
    returnTo: logoutUrl.join(''),
  }),
});