Using this code to try and authenticate the SDK. 
import { SDK } from "@ringcentral/sdk";
export default async function fetchRingCentralData() {
  const rcsdk = new SDK({
    server: process.env.RC_SERVER,
    appKey: process.env.RC_CLIENTID,
    appSecret: process.env.RC_CLIENTSECRET,
  });
  const platform = rcsdk.platform();
 
  await platform.login({ jwt: process.env.RC_JWT });
}Receiving error
Error: Client authentication is required
The app is set up as a JWT app.

Can someone help?
 
                                    