We're integrating Sign in with Apple into our iOS app
The Apple ID login UI appears correctly on real devices, but after tapping Continue, the system immediately stops and shows code 1001.
This issue happens across multiple devices and Apple ID accounts, even with no prior login history.
We’ve confirmed the following
- Sign in with Apple is enabled in both Developer Portal and Xcode Capabilities
- Automatic signing and provisioning are set correctly
- Device is signed into iCloud and system time is synced
- Performed clean build, app reinstall, and other standard debugging steps
We suspect that the sign in handshake process may not be completing properly due to some kind of account or server-side restriction, and we’d appreciate any insights into this behavior.