Facebook app is Public, but gives error "App not setup" when logging in
In Settings → Basic → Contact Email → give your or any email.
Make sure you have a valid Privacy Policy available.
In the App Review Tab change:
Do you want to make this app and all its live features available to the general public?
to
Yes.
- Go to your App Dashboard.
- Click on App Review which is located in the left side of the menu and make your app public.
- Click "Yes".
I also encountered this issue because I used wrong app id and app secret. Please use valid app id and app secret.
If the app status says that the App is public, yet you see the error with the SDK login, create a new app and start over.
This is a bug on facebook's end.