If you want to connect your Facebook Messanger to the Customerly Live Chat but the "Connecting using Facebook button" seems to be unresponsive, these are the steps you should take:
1. If you use a Mac computer, try to hard refresh and connect again pressing and holding these two keys: Command (⌘) and R.
2. If you use Windows computer, try to hard refresh and connect again with the key F5
Once done, click on "Connecting using Facebook".