Sign in with Apple JS authorization fails before reaching our callback. Endpoint: https://appleid.apple.com/auth/authorize client_id: com.coreone.ioForWeb redirect_uri: https://desktop.gditnw.com/login Result: invalid_client shown in Apple's popup. The exact client_id and redirect_uri are present in the actual request. A deliberately invalid client_id returns a different invalid_request response. The Apple Developer Program membership is Active. The Services ID and Primary App ID belong to the same Team. Sign in with Apple is enabled on the Primary App ID. The Services ID is configured, linked to that Primary App ID, and saved. There has been no App ID transfer. Please inspect and re-provision the server-side Sign in with Apple registration for this Team / Services ID.