@saraunruh Today there is a TurboTax Article relating to this known issue. Developers are working to resolve the issue. See the article I'm linking below to sign up for email notification when this is resolved. So sorry for the inconvenience.
Why is Form 8915A-T preventing me from e-filing?
*** I am NOT a tax expert. I am a seasoned TurboTax user, and volunteer to provide assistance to TT users. Nothing I post is to be considered TAX ADVICE; I bear no legal liability for responses.***
