Hi there, @dmcdougall. 

Thanks for all the information you've shared on this thread. I understand the need of having this form accessible anytime. 

Rest assured, our product engineers are working for permanent resolution so you can get back up and running. 

 I'd recommend contacting our QuickBooks Online support team so you'll be added to the list of affected users. 

To ensure your issue gets address right away. please check our support hours. 

You may need more information about accepting electronic customer payments for online invoices. This article will guide you through the process: Take and process payments in QuickBooks Online with QuickBooks Payments.

To learn how to accept credit card or debit card payments in QuickBooks Online, you can read through this article: Process a credit card payment in QuickBooks Online.

You can always come back if you have additional questions about the ACH form. We'll be happy to help. Have a great day!