The endpoint you’re calling is part of the Auth0 Management API and the access token you have is only valid to your own API (identifier by http://localhost:3000/api) and the user information endpoint (identified by https://dev-qqws1971.auth0.com/userinfo).
With that access token you would be able to call the user information endpoint instead of the Management API (see reference docs for user info at Authentication API Explorer).
Have in mind that the user information endpoint will only return the subset of user information (profile) to which the access token grants access to (it will depend on the OIDC scopes requested originally).