What is the reason why VAT invoices cannot be authenticated online? The VAT invoice could not be authenticated online for the following reasons: (1) The invoicing party failed to upload the offline invoice, please contact the invoicing party to confirm the upload status of the corresponding invoice in the invoicing software; (2) To confirm whether the enterprise has changed its tax number, please log on to the check platform to check "File Information Maintenance"; (3) The invoice may be abnormal, please go to the "Invoice Query" module for verification and query; (4) Please verify the accuracy of invoice number, code, buyer identification number and other information, and confirm whether the invoice is issued incorrectly.
