React seed project throws a 401 unauthorized error out of the box

[javlc]

Auth0 tutorial React reference: https://auth0.com/docs/quickstart/spa/react/no-api

After downloading and serving the React seed project (no api), the app throws a 401 unauthorized error.

I tried hard-coding the token parameters (auth0 clientId & auth0 domain) as per the instructions in the tutorial, but received the same error.

UPDATE: Problem resolved.
Ensure to use a port different than 3000 when serving the seed project, May be needed updating the instructions in the project's readme file.