1. Industrial and commercial certification may be in progress: in the process of applying for industrial and commercial certification, merchants need to submit a series of materials and applications, which may take some time. Therefore, if a merchant has just started to apply for industrial and commercial certification, consumers may not be able to obtain formal invoices with industrial and commercial certification before the certification is completed.

2. The merchant may not update the certification information in time: If the merchant has obtained the industrial and commercial certification, but fails to update the certification information in time for some reasons, consumers may not be able to obtain a formal invoice with industrial and commercial certification when purchasing goods.

3. There may be irregularities in the business: if there are irregularities in the business, such as false propaganda, selling fake and shoddy goods, etc., it may not be possible to provide formal invoices with industrial and commercial certification.