When preparing an amended state return, it is important to select the option to paper file the federal so that it will not be sent. You can disregard the rejection since it was not intended to be sent anyway.
To amend the state only, sign in to your TurboTax account if you're not already signed in.
Once the amendment is triggered, and the correction has been completed, follow the prompts for how to submit it to the state. Only Georgia, Michigan, New York or Vermont amended returns can be e-filed. All others must be paper filed.
If your tax return changed due to the retroactive tax law changes passed in March, 2021, check with your state's Department of Revenue to confirm an amended return is required. Many states are automatically correcting returns for some matters.
For more information, see: Do I need to amend?
To reach out to your state, start here: How do I contact my state Department of Revenue?