Hello,
First, I want to say thank you for Flarum founders, because they created this beauty (I mean Flarum)
And second, I have a problem with this beauty. More concretely, with Facebook autenthicator. I created Facebook login app in developer.facebook.com, then I installed Facebook login extension in my Flarum forum, I wrote API Key and App secret, but when I try to login in with Facebook I get a error which says, that I need to write all App domains, but the problem is, that I think, I already done that. Maybe it is my problem? What do I need to write in "App domains"?