I too have had the same issue. I have been trying for 7 business days straight now. Calling support and chatting with support. I have gotten so many reasons for why my ACH processing is not working. From clients bank to I haven't been approved to process ACH payments. I tried my personal bank for $5.00 and came to find out its not even transmitting to the bank so that wasnt the issue. Then I was told the bank information I am entering is incorrect. (For all 14 invoices, including my bank account information) They are all correct, I have been billing these clients for some time now. 

Then once I was approved to process ACH's, I continued to get the same error message. I called, 2 agents from QBO support team ended up hanging up on me. I then tried Chatting and support team asked to wait 24 hours to resolve the issue. They claimed "back end team" is resolving the matter. This was 4 days ago. 24 hours went by, same issue and have been stuck in a loop since. Been waiting 24 hours for 4 days now, still no resolution. During this time, I have asked to speak to the back end team or some that can actually answer some questions. I have been told 7 times, your situation has been escalated and will be top priority for us. Your issues will be resolved in 24 hours. Again, top priority? Its been 7 business days?

I read all the replies and seems like no one has had a legit reason to why this is happening to QBO users. This is really frustrating and I cant seem to get answers.  

If someone was able to get this error message corrected, please let me know and give me some hope.