Not getting a value back

[booti101]

Sorry, i am not brilliant with the Home Assistant coding, so tend to modify what's already there to give me what I need.
In this instance i have copied a Mushroom Card from the main page here and I am trying to add a value to show the countdown timer on my washing machine.

The original code is

type: custom:mushroom-template-card
primary: Dryer
secondary: >-
  {% if is_state("sensor.dryer", "on") %}

  Running {{ state_attr("sensor.dryer", "current_course") }}

  Currently {{ state_attr("sensor.dryer", "run_state") }}

  {{ state_attr("sensor.dryer", "initial_time") }} total, {{ state_attr("sensor.dryer", "remain_time") }} to go

  {% else %}

  Off

  {% endif %}
icon: mdi:tumble-dryer
entity: sensor.dryer
multiline_secondary: true
icon_color: '{{ "indigo" if is_state("sensor.dryer", "on") else "" }}'
tap_action:
  action: more-info

which i have updated for my device to be

type: custom:mushroom-template-card
primary: Washing Machine
secondary: >-
  {% if is_state("sensor.washer", "on") %}

  Running {{ state_attr("sensor.washer", "current_course") }}

  Spin Speed {{ state_attr("sensor.washer", "spin_speed") }}

  Water Temp {{ state_attr("sensor.washer", "water_temp") }}


  Currently {{ state_attr("sensor.washer", "run_state") }}

  {{ state_attr("sensor.washer", "countdown_time") }} till cycle starts

  {{ state_attr("sensor.washer", "initial_time") }} total, with {{
  state_attr("sensor.washer", "remain_time") }} left to go 

  {% else %}

  Off

  {% endif %}
icon: mdi:washing-machine
entity: sensor.washer
multiline_secondary: true
icon_color: '{{ "green" if is_state("sensor.washer", "on") else "" }}'
tap_action:
  action: more-info
fill_container: false

However the countdown_time constantly returns a NONE value in the card, even though if i look at the entity or run an entity card, it shows the correct value.

I am doing something wrong in the coding no doubt, but i cant see what

Could anyone offer any assistance please?

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