There can be multiple reasons why your Bank account verification may have failed.
To know why your Bank account verification was rejected, kindly check your registered email. Here is an example of an email for your reference:
If you are unable to view this email in your inbox, please check your spam folder as well.
If your Bank account verification is rejected, you can proceed to re-upload from the App or Web or by clicking on the "Upload your Bank Account" button in the email.