...
After you've completed creating the app, head to the app's navigation menu. You need to do the steps below before your app setup is complete.
...
Go to App Review > Request Permissions and Features
...
When you click on the Request Permissions or Features button, you'll be redirected to Facebook Login Use Cases. You can set the permissions for scopes here. Add public_profile and email permission by clicking on the "Add" button.
...
Go to Settings > Basic
This tab contains the App ID and App Secret.
...