need to get the token and it returns a lot of information
getTokenSilently$(options?): Observable<string> {
        return this.auth0Client$.pipe(
          concatMap((client: Auth0Client) => from(client.getTokenSilently(options)))
        );
      }
    const token =  auth.getTokenSilently$()
https://auth0.com/docs/quickstart/spa/angular2/02-calling-an-api