The error it gives is this:
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
The app domain is set in the settings for the site. Its not on a subdomain and the site is using https. I have even setup the www just in case under the settings.
Looking into it, I see that under Products, Facebook logins settings, not only is enforce https forced to on, but this also:
Use Strict Mode for Redirect URIs Only allow redirects that use the Facebook SDK or that exactly match the Valid OAuth Redirect URIs. Strongly recommended.
This setting can not be changed to off as I read other places to fix this now. Adding the domain there, throws a failed error that the redirect URI is not whitelisted and matching.
What would the redirect be for discourse for both creating an account and login to an account?