I am having the exact same issue and I noticed it coincides with also being unable to file my return. I get the message below when trying to file. I have spoken to customer services multiple times with no luck. I have also tried multiple computers and browsers.
Your transmission didn't go through
We could not e-file your return for the following reason:
We had a problem while saving your return for filing. Please try to e-file again and if that fails contact customer service.
