Hello there, @edh1. I want to ensure this will be taken care of.

Since you're still unable to access and complete the authorization form, I highly recommend reaching out to Merchant support team to further investigate the issue. They can also provide additional steps to help you resolve this. 

In the meantime, you can look for an authorization form for ACH agreement from outside of QBO as a workaround. 

I've attached this resource that you can use as a reference in processing an ACH bank transfer for your customer transactions: Process an ACH bank transfer from a customer in QuickBooks Online (QBO).

With QBO, its also easy to process electronic customer payments for online invoices and in-person sales. For detailed guide, please read this article: Take and process payments in QuickBooks Online with QuickBooks Payments. 

I'll be always here ready to provide assistance if you have any other concerns about managing customer payments in QBO. Have a great week ahead and stay safe.