It turns out the payment was lumped in with another payment on the same day and we did not catch it.

I did that and went through two chats before finally being given the following link to payments.quickbooks.intuit.com/learn-support/help/en-us/contact-usGoing t...

Thank you for the reply. The echeck was issued on Sep 8. The bank can find no record of it in their system. We routinely receive ACH payments and they work fine...