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What does the short message of high-speed rail ticket mean that the alternate channel is not opened?

The high-speed rail ticket sent a text message saying that the ticket purchase was unsuccessful because the backup channel was not opened. According to relevant data, during the peak period of train ticket booking, some vehicles have no reserved tickets, but spare tickets are available. You can book standby tickets first and wait for the system to allocate tickets. If the received SMS is told that the backup channel is not opened, it means that the ticket purchase is unsuccessful and the shift change or travel mode is needed.