The reason for the failure of invoice verification is that there are illegal characters in the invoice issued by the enterprise, or the electronic invoice signature fails due to the abnormality of the billing system and tax system. Failure of invoice verification is usually caused by non-human reasons. For invoices that fail to be signed, the enterprise shall promptly consult the relevant personnel of the competent tax authorities to solve them. If the signature inspection fails, the invoice that failed the signature inspection can be voided in the billing system in the current month; If it is necessary to go to the competent tax authorities for stub registration, the local staff will sign the invoice again and upload it to the local system.