huh, interesting. I was able to make a payment a few days ago under both mine and my spouse's SSN. I used the workaround described here: https://frequentmiler.com/pay-taxes-via-credit-card/comment-page-7/#comment-2330953 However, when I'm trying to make a 2nd payment with either of our SSNs, I'm once again getting the issue with the window closing right way, even using that workaround. I tried changing the SSN as your described above, and that actually fixes it. So maybe the system only allows you to use PayPal for the first payment of the quarter? Also, this make me suspect the entering CC info has nothing to do with it.
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