Quick Pay Payment Failed
When you get a Quick Pay payment "Failed" message/email the cause can be the biller's website payment rules.
Bill Pay creates an ACH credit transaction in which your bank "pushes" the payment to the biller. Except for extremely rare circumstances, the biller must accept the payment.
Quick Pay, however, logs into the biller's website with your credentials and bank account information and creates an ACH debit transaction. The biller's web site "pulls" the money from your bank account. Quick Pay may use the same web portal that users use or may have a special portal (typical for credit cards).
It's not uncommon for the biller to have rules on payment to prevent duplicate transactions or possibly fraudulent transactions. For example, Pacific Power will deny two transactions on the same day from the same bank account no mater the amount or if you still owe.
The Quick Pay login usually occurs withing a few hours, if not minutes, and if the transaction fails you will get a email and Quicken message very quickly. This means that the biller never contacted your bank - ACH transactions are batched and sent overnight.
If you get the failed message the next day or later, first contact your bank. If they have denied the ACH transaction, for example, insufficient funds, they will be able to tell you the reason the transaction failed.
To get more information on why a "same day" transaction failed, call the biller's support line and ask for web/online support. (Skip the billing department, they usually can not see the failed transaction.) Ask web support to examine "your" login for the date you created the QuickPay transaction and tell you why the transaction failed. It was my experience that even web support was unaware of all of the rules to deny a transaction.