I'm the hotel manager. I don't know why there is something wrong with our room card system. Many cards show authorization errors.

Generally, the locks of smart lock manufacturers will encrypt the locks and cards before leaving the factory. If the password of the card you bought is different from the password of the manufacturer, you will be prompted that the card is illegal or the card issuance failed. As you said, the authorization error should be caused by the incomplete encryption of some cards during encryption or initialization. If the system wants to identify successfully, only correct encryption can do it!