authentication failure means that when users try to access some protected network resources, they cannot complete the authentication process because they fail to pass the authentication or permission check. This situation may occur in many occasions. For example, when using a credit card to conduct a transaction, the system may prompt "Please ask the bank card authentication institution to verify whether the customer has the right to access the system". At this time, if the verification fails, it means that the authentication fails, which means that the access fails. The process of authentication usually includes verifying whether the user has the right to access specific resources, which can be realized in many ways, including but not limited to password verification, digital signature verification and so on. In traditional authentication methods, users usually need to verify their identity through passwords, while in some modern authentication mechanisms, digital signatures or other security measures may be used to confirm the identity and authority of users. If authentication fails, users may need to check their account information, passwords or other security settings to ensure that all information is accurate and up-to-date. If the problem still cannot be solved, you may need to contact the service provider or financial institution for further assistance.