Because the social security information was not updated that month. The reason why the invoice for paying the social security fee can't be found in the official WeChat account of Liaoning Taxation is that the social security information was not updated in that month, and it has not been found since the social security was paid. It may be because the social security payment system is delayed, which leads to the untimely update of the social security information system. I can wait for a while and then inquire.