Hello, Neal S.
I appreciate you for getting back to us and giving updates about the result. Let me help you get the support you need to fix the issue about the rejected ACH and returned invoice.
Since you've already performed the suggested troubleshooting steps above, I suggest contacting our merchant services support to investigate the issue further. They have more tools, like screen sharing, that can help you resolve your concern.
The Merchant Service direct chat link is found here: Contact Payments Support.
Also, here's a couple helpful articles about rejected ACH transactions:
Please let me know if there's anything else I can do to help on rejected ACH payment @Neal S. I'll be glad to help.
