Facebook OAuth "The domain of this URL isn't included in the app's domain"

In case someone comes across this and is looking for these settings (like I was)

You have to

1. On the left hand side, click "+Add Product" and select "Facebook Login" (it was at the top for me)
2. See the new settings available on the left hand side
3. You will now have these OAuth settings on that "Product Settings"

Additional Info: Make sure to add the Callback URL like http://localhost:3000 to the Valid OAuth redirect URIs field on the settings page of Facebook Login

This usually happens if you have entered the wrong details when you created the App in Facebook. Or have you changed a URL's of an existing App?

Can you please recheck the settings of your APP in this page?

https://developers.facebook.com/apps

1. Select the correct App and click in the edit button;

2. Check the URLs & paths are correctly entered and are pointing to the site where you have installed Ultimate Facebook plugin.

I had the same problem. I solved it by adding my OAuth redirect URI as a argument to the getAccessToken function call:

$redirectLoginHelper->getAccessToken("https://www.example.com/myfacebookcallback")

If no argument is sent into that function the SDK generates the redirect URI by itself which should work but in my case it didn't.

Hope this helps someone.