Tjluoma
9
The “This Device Key” should definitely show the Stream Deck key that you pressed.
If your Stream Deck is plugged in and the Streak Deck software is running, Keyboard Maestro ought to be able to sense when a button is pressed.
If it does not, I would quit the Stream Deck app and re-launch it.
Then, in Keyboard Maestro where it says “None” - click it and it should prompt you to press a button on the Stream Deck.