2019-06-05 UTC
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Zegnat There is logging in to things (”itme”) and there is authorising things to do stuff (“canihaz”). Apple sign-in can only support itme, it can only proof who you are. So Apple is saying that if your app allows itme proof through external parties (e.g. Facebook) is must also allow it through Apple. Because Apple can never provide canihaz, the current assumption is that when third-parties (e.g. Google OAuth for Calendar access) are