I've been struggling with "Sign in with Apple" for days. Firebase Authentication returns "configuration not found". I've tried everything. My configuration (all verified correct): App ID: com.pome.ai Services ID: come.pome.ai Key ID: 8UXM48JT9D (newly created) Apple Team ID: KDAMDMPNAW Domain: pome-ai.firebaseapp.com Return URL: https://pome-ai.firebaseapp.com/__/auth/handler What works: Android version (Google Sign-In) works perfectly Anonymous sign-in works What I tried: Created new Service ID and Key multiple times Verified Return URL has double underscore (__) Added authorized domains in Firebase Cleared iPhone cache, reinstalled app, restarted device Tested on different networks The error occurs only on iOS when tapping "Sign in with Apple". Firebase returns "configuration not found". Any help would be greatly appreciated.