1. The digital certificate client is missing or damaged. If CA verification fails due to the loss or damage of the digital certificate client, you need to download and install the digital certificate client again.
2.CA certificate problem. If there is something wrong with the CA certificate, you can try another computer for verification. If you still can't verify it after replacing the computer, you may need to apply for a new CA certificate at the tax bureau.
3. Whether the 3.CA certificate was obtained by the national tax. If the verification fails, it is necessary to confirm whether the CA certificate is obtained by the national tax. If not, you need to take a copy of the unit tax registration certificate and the ID card of the agent to the tax bureau under your jurisdiction to collect it.
These are just some possible reasons. If the specific error information is not clear, it is recommended to consult the relevant tax bureau or contact the technical support telephone number 8 185288 1 for consultation.