Feedback Assistant: FB24556583
Please inspect Sign in with Apple server-side registration for Team LQR9X2NWFT / App ID com.kanca.kanca. This is not a client-code or JWT issue. It is blocking App Store review (Guideline 2.1(a)).
NATIVE
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Bundle ID: com.kanca.kanca
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App Store id: 6804206744
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ASAuthorizationController / Flutter sign_in_with_apple. System sheet opens (Hide My Email), Face ID succeeds, then Apple's sheet shows Sign Up Not Completed. No identity token reaches the app. The app does not appear under Settings > Sign in with Apple.
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Reproduced for days. App Review reproduced it on iPhone 17 Pro Max iOS 26.6 and iPad Air 11-inch M3 iPadOS 26.6.
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App ID has Sign in with Apple enabled as a primary App ID. Capability re-saved; no change.
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Same Apple ID completes Sign in with Apple in other teams' apps on the same device.
WEB
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Services ID: com.kanca.kanca.web
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GET https://appleid.apple.com/auth/authorize?client_id=com.kanca.kanca.web returns invalid_client before any login form (also via curl; no JWT involved).
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Dummy POST to /auth/token with a valid ES256 client_secret (iss=LQR9X2NWFT, sub=com.kanca.kanca.web, kid=KKYD9GMJS6) and a fake code returns invalid_grant, so the key/JWT/client_id are accepted at the token endpoint. Authorize still reports client not found.
Please repair SIWA registration for this team/App ID. Happy to attach a sysdiagnose if needed.