@HeatherPLO’s step by step advice for line [phone number removed] is the best advice. After setting up my Online Payment Agreement I received an initial direct debit installment agreement ie DDIA confirmation (which you should print, screenshot or save to pdf BEFORE exiting b/c you may not see the terms again until you get a letter). However when I logged back in to see my payment plan it stated under the OPA header "We are unable to complete the transaction you requested/Call the IRS”. I was worried my payment plan didn’t go through so wanted to confirm with IRS. The person I first connected to told me since I had just filed within the last 48 hours is likely why I didn’t see my OPA details yet but that his department could not “see” my specific OPA so he transferred me to what I believe the agent answered as “collections”. That agent was able to look-up and verify my OPA/DDIA agreement and terms.
She also stated that since I filed in April it may take until May or June until the balance owed posts to your account - thereafter you will receive a letter stating the whole balance owed (but don’t worry as you have the payment plan in place). Also, you can make an additional payment prior to your balance populating your irs account - it will be credit until they apply it when the balance owed finally links up. You can go to irs.gov and on the header click Pay and there are various options the easiest being Direct Pay which does not require you to log-in (or make a CC payment for a fee).
I hope this was helpful, it was hard to find information on the OPA and the specific error.
