爸妈到北京面签当天(2023.05.09)被通知预约取消，太坑吧

父母年事已高，坐火车来趟北京不容易，那怕提前一天通知也好啊，凌晨接到邮件真是无语。还有就是再约最早的已经是七月，五月六月不显示是已经都满了吗？

取消原因是什么

Due to unexpected technical difficulties, the Embassy of the United States in China is cancelling all non-emergency NIV visa appointments on Tuesday May 9, 2023. If you scheduled a visa appointment with the U.S. Embassy Beijing for May 9, your appointment has been cancelled, please do not come to the Embassy. However, new appointment times have been made available. You can reschedule your appointment tomorrow afternoon by following the instructions https://www.ustraveldocs.com/cn/cn-niv-visaapply.asp. Unused MRV fees remain valid for 12 months from the date of purchase.  You must reschedule your appointment within that time frame in order to avoid paying a new MRV fee.  Applicants with urgent travel can click https://ustraveldocs.com/cn/cn-niv-expeditedappointment.asp for instructions for requesting an expedited appointment.