cross-account.js

const AWS = require("aws-sdk");
const Connect = require("aws-sdk/clients/connect");
AWS.config.setPromisesDependency(require("bluebird"));

// Account 1 - Core services... after learning things in customer connect account we write to DynamoDB in this account
AWS.config.update({
  accessKeyId: "xxxxxxxxxxxxxxxxxxxxxxxx",
  secretAccessKey: "xxxxxxxxxxxxxxxxxxxxxxxx",
  region: "us-east-1"
});

// instantiate Connect
const connect = new AWS.Connect();

// Account 2 - Update connect config. The Connect instances live in different AWS Accounts.
connect.config.update({
  accessKeyId: "yyyyyyyyyyyyyyyyyyyyyyyyyyyyyy",
  secretAccessKey: "yyyyyyyyyyyyyyyyyyyyyyyyyyyyyy",
  region: "us-west-2"
});

console.log("connect.config: ", connect.config); // This correctly shows us-west-2
console.log("AWS.config: ", AWS.config); // This correctly shows us-east-1

var params = {
  InstanceId: "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" // InstanceId in "us-west-2"
};

const users = connect
  .listUsers(params)
  .promise()
  .then(res => console.log(res)); // "Credential should be scoped to a valid region, not 'us-west-2'"