I am a customer of merchant that uses QB Payments and am having the same issue.  I my case it was sort of self-inflicted as our bank (chase) recently implemented an ACH Debit Blocking (screening) service on our account, which I suspect is the same issue that a lot of payors with Bank of America or Citibank accounts are likewise experiencing.  I was able to clear the issue on my bank's side for future transactions, but QuickBooks Payments still has my bank account blocked on their side.  So now I am in the same situation as everyone else on this thread, and likewise was told today by QB Support that the merchant would have to contact QB Payments Support.

Of any of the merchants on this thread, just curious if anyone has tried voiding and creating a new (duplicate) invoice using this procedure (or something similar)?:

   https://quickbooks.intuit.com/learn-support/en-us/help-article/banking/handle-rejected-failed-bank-t...

If so, did anyone have any success with that "solution"?

I also found the following QB article that may be relevant to this thread: https://quickbooks.intuit.com/learn-support/en-us/help-article/money-movement/fix-rejected-ach-payme...

Unfortunately, I have no idea what R error code my transaction was since neither the merchant or I (the payor) received any email when the original declination occurred.  Also for a number of the causes, it says that a bank letter has to be sent into QB before they will resolve, but then provides no email or mailing address to send said letter to.

For what it is worth, I as the payor I also tried deleting and re-adding my bank account to my QB payment profile, but that did not achieve any progress either.