Google Home, Home-Assistant cloud, can't turn lights on

Configuration
1

Since today my Google Home understands Dutch so I’ve added 2 groups to my config:

 cloud:
  google_actions:
    filter:
      include_entities:
        - group.wc
        - group.woonkamer
    entity_config:
      group.wc:
        name: Toilet
      group.woonkamer:
        name: Woonkamer

These groups show up in the Home app but I can’t turn the groups on or off. Is it even possible to control a group ?