If you use self-service check-in, you must first contact the hotel gate code, and then use the self-service check-in machine to check in. You need to enter the order number (a bit too long) and make sure it is given by the hotel, not the order number from the trip.
The air conditioner in the room we checked in this time was broken, and it was a bit slow to contact customer service. In the end, we were given a room change, but we had to go back to the card duplicating machine at the counter on the first floor to change the card.
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