We need to contact the bank to request a refund for the payment, Norman.
When payment is made to a closed account, the bank usually returns the payment to the sender after attempting to process the deposit.
We can inform the customer that it was sent to a closed account and ask if they received a notification from their bank regarding the failed deposit.
Next, reach out to the bank where to inquire about their process for handling deposits made to closed accounts and how long it typically takes for funds to be returned.
To prevent future issues, update your QuickBooks active bank account details in the Banking Transaction menu and advise your customer about the changes to ensure payments are received correctly.
I’ve added this article to help you review your financial accounts and ensure they match your bank statement: Reconcile an account in QuickBooks Online.
Add your comment below if you need more guidance about handling your bank in QuickBooks Online.