Why can't serial number app be used?

System card error. Lianhao app belongs to Linquan Lianhao Information Technology Co., Ltd. and was established in 2020. According to the query of official website of Linquan Lianhao Information Technology Co., Ltd., the system card bug will not be used due to the imperfect previous procedures. Business scope: computer software technology development, advertising design, production, agency, publishing, conference services, exhibition services, etc.