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Hello. I am getting this error message from this URL:

authorize

{
  "errorCode" : "AGW-404",
  "message" : "Resource not found",
  "errors" : [ ]
}

I have a local copy of the ringcentral-embeddable app. My client ID is 5FrUBQjLTqSi0sU4WdcfbQ

Please would you let me know if I need to register this in some way, or what I'm doing wrong!

Script within my homepage is:

(function() {

var rcs = document.createElement("script");

rcs.src = "https://sandbox.workbooks.com/ringcentral-plugin/adapter.js?clientId=5FrUBQjLTqSi0sU4WdcfbQ&appServer=https://platform.devtest.ringcentral.com/&redirectUri=https://sandbox.workbooks.com/ringcentral-plugin/redirect.html&prefix=wb-ringcentral-widget";

var rcs0 = document.getElementsByTagName("script")[0];

rcs0.parentNode.insertBefore(rcs, rcs0);

})();

Thank you