1. There is no current digital certificate client, or the client is damaged and needs to be reinstalled;

2. If there is something wrong with the CA certificate, please try another computer. If the verification still fails, you need to go to the tax bureau to reissue a CA certificate.

3.CA also has certificates (including public key and private key). Public users on the Internet trust CA by verifying its signature, and anyone can get CA's certificate (including public key) to verify the certificate issued by it.

Solution:

Call the local tax bureau first and ask them how to install it. If it still doesn't work, report the computer to them and ask them to help install it.