Facebook external authentication error on NOPCommerce -

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 sub-domains of your app to the App Domains field in your app settings.

The domain is included in the developers.facebook.com page for the app.

Just to explain - this always used to work OK but it has now stopped - is this a Facebook update that has caused this do you think?

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It was the callback URL that was the problem - I have to go to developers.facebook.com and under teh facebook authentication settings I had to re-enter the URL with /signin-facebook on the end. The strict re-direct was obviously the issue.

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