Display the value of a input_text in a log message

Configuration
9

That’s your problem then.

Either you have not got the correct entity id (check in Developer Tools / States) or it has no state set.

EDIT: I’ve just noticed how you are setting the input_text. Try this instead:

  - service: input_text.set_value
    target:
      entity_id: input_text.light_to_switch
    data:
      value: '{{ states.group.simulation_lights.attributes.entity_id | random }}'
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