This works:
scene:
- name: Test
entities:
light.test:
state: on
automation:
- alias: 'Event trigger'
trigger:
platform: event
event_type: call_service
event_data:
service_data:
entity_id: [scene.test]
domain: scene
service: turn_on
action:
service: homeassistant.turn_on
entity_id: script.telegram
data:
variables:
message: 'Test scene was turned on!'