There is an appointment time limit. Make an appointment to repay the mortgage. The system shows that you should repay the mortgage on the 4th of next month, and you can't submit an appointment at present. The reasons are as follows: some loan contracts stipulate the time limit for prepayment, and it is necessary to make an appointment for prepayment before a specific date; Lending institutions have set a time window for making an appointment for repayment, and need to submit an appointment within a specific time range. Please confirm whether you are operating within the allowed appointment time.