In order to enable Connect Server to communicate with the Facebook API during the sign-in process, the authorization server (OAuth) will redirect the user to the Connect Server redirect URL, which by default is: https://oauth.cdata.com/oauth/.
This URL must correspond to the callback URL specified in the application configuration, as illustrated in the accompanying screenshot.
You will have the option to enter this value in the Meta for Developers section of your Facebook login -> Settings page.
