@ANDRES-ROJAS, I might be having the same problem you are. I tried creating a Google Assistant routine that flips one of the virtual switches on, but it won't allow me to select the switch now. I'll look into that, but there's another way that does work.
Here's what worked for me:
Open the Home app Tap Routines Tap the + to create a routine Tap Personal Tap "Add starter" Tap "When I say to Google Assistant" Type "calculator" Tap "Add action" Tap "Try adding your own" Type "turn on calculator"Google_Assistant_Action.png
For this to work, you have to enable the TRIGGERcmd Smart Home action first.