User Profile

I have successfully used "Sign in with Apple" to retrieve the user object containing the name and email. But subsequent calls to the authorize endpoint do not return the user object and the "code" and "id_token" objects are different each time. With Facebook, the user's ID is returned every time so it's easy to associate with the local account which obtained the user ID when they initially signed in with Facebook, but Apple doesn't do this. Am I missing something?