{{trigger.entity_id}} not working as expected & underscore in telegram message

Configuration
21

Managed to get this working without giving up markdown parsing (I like it), here it goes, hope it’s useful to more people:

- service: notify.telegram_bot
  data_template:
    title: '*Alarm triggered*'
    message: >-
      {% set trigger_name = trigger.to_state.entity_id %}
      🚨 Triggered by {{ trigger_name.replace('_','\_') }}
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