I wonder if it has something to do with filing a I-134A after a I-134. Perhaps they see the original I-134 and assume the I-134A is a duplicate.
"If you submitted Form I-134 online before Jan. 6, 2023, under Uniting for Ukraine or the Processes for Venezuelans, your case will continue to process and no further action is required. You should not submit a Form I-134A."
Regardless, the real issue is why they aren't following their own rules and the lack of any meaningful communication. It took them 6 weeks to respond as to why it was marked as duplicate and even then there was no answers, only stating that it was a duplicate that was closed. I think we will try one more time to file a I-134A and again try to clearly explain our previous travel authorization has expired. If this fails, time to contact our congressperson or immigration attorney.