There is presently a bug in TurboTax that is causing erroneous calculations on Form 8606 Part I if the tax return includes a distribution from an inherited IRA. From just the information in your e-filing, it's probably not possible to determine if the tax return includes a distribution from an inherited IRA (not all of the information in your tax file is present in the actual e-filing), so I suspect that this rejection will be occurring for anyone whose tax return includes Form 8606 until the bug is fixed.
The reject message could be more informative.
