If you are still having issues to make the messenger work, you can use this free jot server to make your messenger working while you fix it in your server.
Your site links for the free package points to # and the paid packages state coming soon.
This is the free server url, just add this url into your module's settings, you don't need to do anything else.
It works connected to yours. Now I just need to finish figuring out why it won't work with my server. Thanks for the test MSolutions