I don’t see Garadget in Alexa Routines. I’m using the alternate “Smart Garage” Skill.
I do use Alexa Routines for Garadget but in a kind of convoluted way. I have an Alexa Routine where I say “open the garage” which momentarily triggers one channel on a Sonoff 4ch Pro R2. Then I have an IFTTT Applet that opens the garage based on the button press. This was my solution for having the garage open based on anything I want Alexa to listen for. Trying to get Alexa to recognize “Garadget” or remembering to say “Ask Smart Garage” or “Trigger Open” were not great solutions for me.
A byproduct of doing it this way is that the Sonoff has buttons on it to activate its channels, so it also functions as sort of a wifi garage door remote.