Unfortunately, if you aren't able to access the online automated system to retrieve your IP PIN, then you must either wait for the IRS to re-open or file by mail.
If you file by mail, your return is not going to be processed until the IRS re-opens, either, but it will be in the queue for processing based on the order it was received.
I realize neither option is fantastic - but unfortunately, those are the only options currently available.
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