Solved
However, for the fourth quarter of 2024 the account number should be an 11-digit alphanumeric account number due to a change in 529 account custodianship. This applies to all Illinois filers who made contributions in the fourth quarter of 2024.
See guidance located here: https://brightstart.com/media/3vdllpew/2024-important-tax-information.pdf
My question - Is mailing my Illinois state return the only option for filing?
Thank you
Sometimes there is a TurboTax article published that has a place to register your email address to receive updates. If that article is published, then we try to get back in touch with you with a link to the article or at least one update that the work is in progress. Barring either of those, the best thing you can do is to go through the Illinois return about once per week until the error condition goes away. Program updates are generally released about once per week.
As of 2/9, it is possible to file with a letter. Just remove the dash.
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.