Automation: Reading an attribute and publishing it to MQTT

Configuration
1

This works to send relay state 0/1 to mqtt

- id: relay1_state_to_mqtt
  alias: Relay1_State_ToMqtt
  initial_state: 'on'
  trigger:
    - platform: state
      entity_id: switch.qubino_zmnhadx_flush_1_relay_switch
  action:
    - service: mqtt.publish
      data:
        topic: "service/hasszw1/device/relay_1/state"
        payload_template: '{% if is_state("switch.qubino_zmnhadx_flush_1_relay_switch","on") %}1{% else %}0{% endif %}'
        retain: true

but this ALWAYS publishes 1

- id: relay1_failed_to_mqtt
  alias: Relay1_Failed_ToMqtt
  initial_state: 'on'
  trigger:
    platform: state
    entity_id: zwave.qubino_zmnhadx_flush_1_relay
  action:
    - service: mqtt.publish
      data:
        topic: "service/hasszw1/device/relay_1/failed"
        payload_template: '{% if is_state("zwave.qubino_zmnhadx_flush_1_relay.attributes.is_failed",false) %}0{% else %}1{% endif %}'
        retain: true

If I replace the payload template with
payload_template: "{{states.zwave.qubino_zmnhadx_flush_1_relay.attributes.is_failed}}"

Then I get True and False.

I’ve tried using in the line

is_state("zwave.qubino_zmnhadx_flush_1_relay.attributes.is_failed",false)

multiple values: false, False, “false”, “False”. None of it worked - the result is always 1.

I’m almost pulling my hair…

Thank you for your time!

2

use is_state_attr

 {% if is_state_attr("zwave.qubino_zmnhadx_flush_1_relay","is_failed",false) %}0{% else %}1{% endif %}