Ouch!
The form availability check shows the same status for Mac, Windows, and Online: Form 8911-A is unsupported for e filing but 8911 is ready, at least according to the status link.
However, TurboTax doesn't even fill out an 8911, just the 8911-A. It would be nice if there was a warning in the software as I almost filed the return with no EV charging station credit.
