Mandate Failures Why do mandates fail? Will I be notified if a customer's mandate fails? Why do mandates fail? A mandate can fail when being set up on a customer’s bank account for several reasons. The most common reasons are: The customer has entered their bank details incorrectly The customer’s bank account does not support Direct Debit payments eg. a savings account Will I be notified if a customer's mandate fails? Yes, both you and your customer will receive an email notification once the customer's bank advises us that their mandate has failed and cannot be set up on their account.