After some digging the simple group switching with Alexa can be achieved setting:
domain: homeassistant
Service: Toggle
Node Red Flow:
[{"id":"119b8319.9276ad","type":"tab","label":"Flow 1","disabled":false,"info":""},{"id":"6b42b5fd.39bbcc","type":"amazon-echo-hub","z":"119b8319.9276ad","port":"80","processinput":0,"x":55,"y":40,"wires":[["c92fa7a6.d4dd38"]],"l":false},{"id":"c92fa7a6.d4dd38","type":"amazon-echo-device","z":"119b8319.9276ad","name":"Lamps","topic":"","x":190,"y":40,"wires":[["37f82f9.229a0d"]]},{"id":"37f82f9.229a0d","type":"api-call-service","z":"119b8319.9276ad","name":"Toggle All Lights","server":"babfc2d7.0ceb7","version":1,"debugenabled":true,"service_domain":"homeassistant","service":"toggle","entityId":"group.all_lamps","data":"{\"entity_id\": \"group.all_lamps\"}","dataType":"json","mergecontext":"","output_location":"","output_location_type":"none","mustacheAltTags":false,"x":380,"y":40,"wires":[[]]},{"id":"babfc2d7.0ceb7","type":"server","z":"","name":"HomeAss","legacy":false,"hassio":true,"rejectUnauthorizedCerts":true,"ha_boolean":"y|yes|true|on|home|open","connectionDelay":true,"cacheJson":true}]
Hope this helps others ,although it’s simple ![:slight_smile: :slight_smile:](https://community.home-assistant.io/images/emoji/twitter/slight_smile.png?v=9)