Same issue for me (and I think for everyone, because Apple does not seem to have been thinking about horizontal awnings, in which the logic "open" and "closed" are reversed as opposed to vertical blinds). For now I've deleted the standard Tahoma HomeKit support from my Home app, and use Homebridge on my Raspberry pi for Homekit support via the "Homebridge Tahoma" plugin. There, I checked the "reverse" checkmark. With that it works fine (and Siri actually opens the awning when I ask her to, in stead of the opposite).
mvmaastricht
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