I have heard all of the same reasons from QuickBooks you just gave @SunlitFunlit. Those reasons are just rhetoric. My customers have tried more than one bank account for the payment of an invoice, the funds are available in the account, and the bank is not declining the transaction. It sounds like @SunlitFunlit has paid invoices multiple times and suddenly, @SunlitFunlit doesn't know how to enter the account information!! I still believe it is a QuickBooks problem that needs a solution.
