Problem with handling pubsub messages

Extensions
4

Hello, I’m trying this in node and somehow am stuck as well. Any suggestions? I always get {“error”:“Unauthorized”,“status”:401,“message”:“authentication failed”} returned to me.

const currentSecret = '<base64 encoded secret copied from extension settings>';
const ChannelId = '<my channel id>';
const OwnerId = '<my user id>';
const ClientId = '<client id from overview on my extension>';
const jwt = require('jsonwebtoken');
const request = require("request");

const secret = Buffer.from(currentSecret, 'base64');

const signedJwt = makeServerToken(ChannelId);

var options = {
        url : 'https://api.twitch.tv/extensions/message/' + ChannelId,
        headers :{
                'Authorization' : 'Bearer ' + signedJwt,
                'Client-Id': '<my client id from extensions overview>',
                'Content-Type': 'application/json'
        },
        body : JSON.stringify({
                message: { "foo":"bar" },
                content_type: 'application/json',
                targets: ['broadcast']
        })
};

function details(error,response,body) {
        console.log(body);
}
request(options, details);

// Create and return a JWT for use by this service.
function makeServerToken(channelId) {
  const payload = {
    exp: Math.floor(Date.now() / 1000) + 60,
    channel_id: String(channelId),
    role: 'external',
    pubsub_perms: {
      send: ['broadcast'],
    },
  };
  return jwt.sign(payload, secret, { algorithm: 'HS256' });
}