Form 8911 is unsupported for Efile as of today for both Windows and Mac. This is most likely due to IRS changes not yet being implemented, due to the effect of the OBBB, which includes accelerating the expiration previously in place from the Inflation Reduction Act.
It is supported in TurboTax Online, if you wish to switch.
Here's a link you can use to check on the Form 8911 Efile Status.
@Geoff30
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