In your situation, you should first clear the cache and cookies It handles many issues that seem nonsensical on a regular basis. First close your return and follow the steps below to see that you need to do depending on the version of TurboTax you are using:
TT Business says it does not support the efile format required by the Iowa Dept of Revenue. How is this possible? Is TT going to make efile available with Iowa Dept of Revenue efile format requirements? Iowa says it requires "Modernized eFile (MeF)"
I also used the desktop version of TurboTax Business for Windows. To clarify, it was an error message in TT Business for Windows that alerted me to this problem. TT Business would not attempt to efile, but only gave an error message. I cannot file by paper because my business has more than $250000 in gross receipts.