Token getting Unauthorized

We are trying to connect our app and we keep getting unauthorized for the token.

That's our payload (we did remove sensitive data):

import axios from "axios";

import crypto from "crypto";

const APP_TOKEN = "";

const APP_UUID = ""

const PROVIDER_UUID = "";

const PROVIDER_SECRET = "";

function base64UrlEncode(input) {

 const buffer = Buffer.from(input);

 const base64 = buffer.toString("base64");

 const base64Url = base64

  .replace(/\+/g, "-")

  .replace(/\//g, "_")

  .replace(/=/g, "");

 return base64Url;

}

(async function(){

 let UUID = (()=>([1e7]+-1e3+-4e3+-8e3+-1e11).replace(/[018]/g,a=>(a^Math.random()*16>>a/4).toString(16)))();

 var header64 = base64UrlEncode(

  JSON.stringify({

   alg: "HS256",