How can I get my Template Sensors to update?

Configuration
1

Hi,
I have these sensors defined in my configuration.yaml

mqtt:
  sensor:
    - name: rwg_tx_quota
      unique_id: "tx_quota"
      unit_of_measurement: "bit"
      state_topic: "quota/tx"
      
    - name: rwg_rx_quota
      unique_id: "rx_quota"
      unit_of_measurement: "bit"
      state_topic: "quota/rx"
      
template:
  - sensor:
      - name: "rwg_total"
        unit_of_measurement: "GByte"
        state: >
          {{ (((states('sensor.rwg_rx_quota')) | float + (states('sensor.rwg_tx_quota')) | float ) / 800000000) | round(3)}}
               
      - name: "rwg_balance"
        unit_of_measurement: "GByte"
        state: >
          {{ ((20.00 | float) - ((states('sensor.rwg_total')) | float)) | round(3) }}

The mqtt (rwg_tx_quota & rwg_rx_quota) update in real-time. However, the template sensors (rwg_total & rwg_balance) only seem to update on system restart.
I have tried adding update_interval: 60s, but that is reported as an error?

Logger: homeassistant.config
Source: config.py:592
First occurred: 09:11:44 (2 occurrences)
Last logged: 09:24:45

Invalid config for 'template' at configuration.yaml, line 44: 'update_interval' is an invalid option for 'template', check: sensor->0->update_interval

Any thoughts…
Regards, Martin

2

Please provide sample values

3

Is this what you mean?
image

If not, let me know how.
Regards, M.

4

No, actual values, to test your templates (in text, please, not pictures)

5

Sorry Chris,
Can you show me how?
Regards, M.

6

That

image

7

Thank you Chris. So values cut 'n paste from Developer Tools are:
sensor_rwg_tx_quota = 11476485
sensor_rwg_rx_quota = 308853558

Any help?