I was getting the "Cannot determine eligibility" message until today, when it prompted me to enter my bank information. (I owed in 2018 and have not yet filed for 2019.) When you enter your AGI and refund/payment from your most recently filed return, truncate to the nearest dollar -- don't round. I rounded my payment the usual way, and got the message, "information provided does not match our records". Decided to truncate the number and it processed.
I don't need the money, by the way -- I just get curious about things such as this. I've already donated the entire amount I have coming.