Error: 401 Unauthorized: {“error”: “Missing x-token”} gRPC

can somebody help me with the Error: 401 Unauthorized: {“error”: “Missing x-token”} with gRPC connection??

this is a snip of my code..

const client = new GeyserService(
  process.env.HTTPS_ENDPOINT || 'grpc-ams2.erpc.global',
  grpc.credentials.createSsl()
);

function callPingMethod() {
  const metadata = new grpc.Metadata();
  const apiKey = process.env.API_KEY;

  if (!apiKey) {
    throw new Error("API_KEY is not set in the environment variables.");
  }

  metadata.add('x-token', apiKey);