Can't load URL error when attempting F B login

So far I have only attempted to (am only interested in) allowing people to login to my SMF forum via Facebook.

I have set up an account, and ensured that the subdomain, public and private keys are correct.
They have verified succesfully.

The API connection handler is the default PHP CURL
The API connection port is the default - connect via https on port 443

My forum is located at
API subdomain is: gsx1400owners

I am getting the error
Can't load URL. The domain of this URL isn't included in the app's domains. To be able to load this URL, add all domains and subdomains of your app to the App Domains field in your app settings.
Could this be an issue with using https (port 443) rather than http (port 80)?

As far as I know I don't have Open SSL on my server. I don;t think I need it for my forum (as yet)., but is there any harm in doing so?

Really keen for help on t his one as my members are very interested in this option.

Thank You



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