Using the auth0-spa-js when calling the method getAccessTokenSilently while not logged in the simulation server responds with "server error" and a http status of 500.
This causes the promise returned from getAccessTokenSilently to never be resolved.
When calling the real Auth0 in this scenario the endpoint returns a http status of 200 and getAccessTokenSilently promise is rejected with the error
error: "login_required" error_description: "Login required" message: "Login required"