Possible bug in JWT

Hello, I am attempting to create a JWT token using the internal utils provided.
However, I am faced with the error: x509: failed to parse private key (use ParsePKCS8PrivateKey instead for this key format)

let currentDate = Math.floor(new Date().getTime() / 1000);
let header = {
  typ: "JWT",
  alg: "ES256",
  kid: "....",
let payload = {
  iss: ".....",
  aud: "....",
  iat: currentDate,
  exp: currentDate + 60 * 59,
let privateKey = `-----BEGIN PRIVATE KEY-----
-----END PRIVATE KEY-----`;

let token = utils.jwt.encode("ES256", payload, privateKey, header);

Per the docs the key need to be an An ECDSA private key in PKCS#8 format. which it is.
On my local machine using var jwt = require("jsonwebtoken"); it works perfectly fine.

Other variations I have tried:
1- loading the key from a package my_key.p8
2- base64 encoding the key
3- removing the \n characters