The online banking signature failed because the user entered the wrong bank account number or password, or because the account balance was insufficient or the account was frozen. In these cases, users need to check whether the input information is correct and confirm whether the account is in a normal state and whether the account balance is sufficient.

The failure of online banking signature may also be caused by network connection problems. In this case, users need to check whether the network connection is stable and try to log in to the online banking system again. If the problem still exists, users can contact bank customer service for consultation and help.

Another reason that may lead to the failure of online banking signature is that the certificate has expired or been revoked. The user needs to check whether the certificate is still valid. If it is no longer valid, they need to re-apply for a digital certificate and install it in the computer. At the same time, some software or plug-ins may have an impact on the operation of online banking, and users need to eliminate these factors before signing a contract smoothly.