Did your 2019 IL tax return show a refund or did it show that you owed tax due to the state? If you were getting a refund, IL would not be worried right now about your 2019 return. If you owed tax due----what did you do to pay the state? Your only proof that you paid IL would be your own bank or credit card record. It is not possible to pay the state from a federal refund, although some people get confused and expect that to happen. You need to check your bank or credit card accounts to see if you paid the state.
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