Works in the template but does not pass for the sensor yaml

this works in the template in dev tools but will not pass the configuration test

it seems to have issues with the straight brackets tried other brackets to no avail

   - platform: template
     sensors:
       main_shower_temp:
         unit_of_measurement: "°F"
         value_template: 
          {{ '%.f' | format(state_attr('climate.main_shower','current_temperature') | float ) }}       
         friendly_name: "Main Shower Temperature" 

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