Unable to login with live chat for non owners

[kaleem68]

Hi running this app

It works: when I try to log in with the user who owns client_id

But if I have any other user i.e any live chat user besides the owner, I get access_denied

    "oauth_exception": "access_denied",
    "exception_details": "the server encountered an unexpected condition that prevented it from fulfilling the request",
    "description": "Probably this application is installed on a different account and you do not have access to it."}

I want to know how can I permit the popup for all live chat for users

Is there any setting where I can adjust the access level?

Please look output of the screenshot

[GustavoContreiras]

I'm having issues too to run their hello world and tag-master sample app.
Can't go through the authentication step even following all examples and instructions.

You can try selecting all scopes.