Sync flair vent and nest thermostat?

I would like to create an automation to sync the mode of my nest thermostat and my flair vent. For example, if i set nest to cool the vent is set to cool. I wrote this to try to achieve my goal:

alias: Sync vent and nest
description: ''
mode: single
trigger:
  - platform: device
    device_id: 7ef1f854d63ea618053bab3dc8592e04
    domain: climate
    entity_id: climate.first_floor_hallway
    type: hvac_mode_changed
condition: []
action:
  - choose:
      - conditions:
          - condition: device
            device_id: 7ef1f854d63ea618053bab3dc8592e04
            domain: climate
            entity_id: climate.first_floor_hallway
            type: is_hvac_mode
            hvac_mode: heat
        sequence:
          - device_id: 61f8e1de739fecd3720bf0e50bcb73eb
            domain: select
            entity_id: select.casa_structure_mode
            type: select_option
            option: Heat
      - conditions:
          - condition: device
            device_id: 7ef1f854d63ea618053bab3dc8592e04
            domain: climate
            entity_id: climate.first_floor_hallway
            type: is_hvac_mode
            hvac_mode: cool
        sequence:
          - device_id: 61f8e1de739fecd3720bf0e50bcb73eb
            domain: select
            entity_id: select.casa_structure_mode
            type: select_option
            option: Cool
      - conditions:
          - condition: device
            device_id: 7ef1f854d63ea618053bab3dc8592e04
            domain: climate
            entity_id: climate.first_floor_hallway
            type: is_hvac_mode
            hvac_mode: heat_cool
        sequence:
          - device_id: 61f8e1de739fecd3720bf0e50bcb73eb
            domain: select
            entity_id: select.casa_structure_mode
            type: select_option
            option: Auto
    default: []

Alas, I’m getting this error:

Message malformed: required key not provided @ data['to']

What did I do wrong?

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