You can only control one type of device at a time. So lights, fans, etc. Ex. "Hey Siri turn on the dining room and bedroom lights" she responds with "You got it" and they come on. For the best success make sure the lights are just called "Light(s)" and the room name is the variable.
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Make sure its using the light icon as well. Switches can be particularly troublesome if you venture too far away from what it actually is. Siri doesn't have the capability to fill in the gaps like a person can but "Hey Siri living room lights" will turn them on and off so the key words Siri is listening for is room and device. That way saying "Hey Siri grab the living room lights" which actually makes no sense what so ever but is used in real life on occasion will actually work for you.
Saying, "hey siri turn on the foyer lights and unlock the front door" won't work because they are different types of devices. The door lock doesn't work from the HomePod regardless but that was an example.
Admittedly this isn't always perfect when I just tried it to verify I wasn't losing my mind she said "Just a moment"...."Hmmm"...."You got it". Still worked on the first attempt however it was iffy for a second or two.
The 'Except' preposition works as well, so if I say "Hey Siri turn on all the lights
except for the dining room" she will do just that.
I have a "I'm leaving" scene however 'except' works pretty well when you want everything to turn off except porch lights and/or xmas lights ex.
I can not get both to work "Hey Siri turn off all the lights
except for the dining room
and foyer". Things get weird and you are better off setting a scene until her AI gets even better.