The issuer does not support the transaction type. China Construction Bank learned through inquiry that the transactions that card issuers do not support are mainly because the credit cards held by users are restricted or frozen, or it may be because such credit cards do not support credit card swiping machines. When a user makes a transaction, the card issuer does not support the transaction, mainly because the credit card held by the user is restricted or frozen, or it may be because this kind of credit card does not support credit card swiping, or there are network reasons. Please check the network and the card itself. If there is no problem, you'd better call the credit card center of the relevant bank for consultation.