Your daughter turned 26 in November 2019? Was your insurance company aware of that? Did they still allow her to be on your policy?
I am thinking that they should have converted you to Single HDHP coverage (perhaps they did not get around to it immediately). In any case, if in December, you no longer had another person on your HDHP policy, then you no longer had Family coverage, which means that you needed to report the last month as Single coverage in the HSA interview in TurboTax.
This would have the effect of reducing your annual HSA contribution limit somewhat for 2019 (eleven months at Family and one at Single).
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