Signature verification failure refers to the failure of the tax digital certificate to add a digital signature to the electronic invoice when the enterprise is issuing electronic invoices and uploading them simultaneously, which is caused by non-human reasons. Generally, failure to sign an electronic invoice due to a malfunction in the tax system is also a failure to verify the signature. If the invoices issued by the enterprise fail to be verified due to illegal characters on the face information, etc., when the verification fails, the invoices that failed to be verified can be invalidated in the invoicing software in the same month. If the invoice has been invalidated, it will continue to prompt " "Verification failed" cannot be issued. It is recommended to bring the tax control disk to the tax bureau to make a copy of the tax return during non-tax periods. If it spans multiple months, you need to go to the competent tax authority to make a supplementary entry of the stub. When doing the supplementary entry of the stub, the bureau personnel will re-sign the invoice and upload it to the bureau system.