Please verify whether the mobile phone can surf the Internet normally. If you can access other online information normally, it is likely that the tax APP server is down for maintenance. For details, please refer to the notice on the websites of tax authorities in various provinces and cities. The login page of the tax APP will also show the downtime and can be resumed. Please log in again after this time.
If you can't log in because of the wrong verification code.
It is possible that you clicked the send verification code twice when logging in, and then filled in the verification code sent for the first time, so the verification code is not displayed correctly. It's best to log in again after logging out, then click once when you click send verification code, and then wait patiently for the notice. Be sure to fill in the verification code after receiving the information, so as to avoid the invalidation of the verification code due to the long waiting time.