A 64023 error is an indication that your Pay Connector is in TEST mode, but you did not provide a valid test bank account number when testing an ACH payment.
Possible Causes
Your pay connector is in TEST mode and you provided an invalid test bank account number when testing an ACH payment. For compliance reasons, we can only allow certain test bank account numbers in TEST mode.
Possible Solutions
Check the documentation for the pay connector in the Twilio Console or in our Twilio docs for valid bank account numbers that can be used when in TEST mode.