It seems like you've exhausted all options available for filing the Illinois return electronically. The only solution left is to file by mail.
You can still file the Federal return electronically if you have not already done so.
TurboTax should give you guidance about how to file the Illinois return by mail when you print the return. The address to use will be on a cover sheet that prints with the return. You will need to attach copies of your W-2s and any 1099-s that you have which have state taxes withheld. Also, don't forget to sign the return before mailing it.
@CaioBeraldo
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