Light Groups - Alexa won't turn all on

I use Alexa, through Nabu Casa, as my voice assistant. It works great when I have a single light or fan to turn on. However, when I create a group, like:

  - platform: group
    name: All Front Office Lights
      - light.fo_desk_lamp
      - light.fo_fan_light
      - light.fo_overhead_lights_switch

Only the overhead lights turn on… the other two do not. If I flip the UI toggle, they all turn on and off as expected. Any ideas?