I appreciate you checking in with us, @6eae0be62bda. I'm here to make sure your concern about ACH gets answered today.
I am aware of how crucial it is for your company to send an ACH authorization form in order to obtain consent for bank-to-bank payments to move money electronically between a payor and a payee. As of the moment, we’re currently unable to give or print a voided blank check.
In the meantime, I encourage you to find an Authorization form for the ACH agreement from outside QuickBooks Online. You can also consider using a third party app that suits your need. See this link to search and compare the programs that you can integrate with QuickBooks: QuickBooks Apps.