Try use app unlock tool unlock,before order.
1.if show "unlock failed,not eligible for unlock"you can order.
2.if show "Server not responding"or other,dont order
(Your Network,firmware or Root Issue)
Once the unlock request is processed, customer needs to
1. connect phone to wifi
2. go to play store and install "Device Unlock" app.
3. open app and select "Permanent Unlock"
Phone will check status from server and reboot.
This service wont reply any code