I Keep getting the extra keys not allowed error in from an entry in customize.yaml

@palengh wrote:

I Keep getting this error

extra keys not allowed @ data['customize']['binary_sensor.*_contact']

… when putting the below code into my customize.yaml file.
When I comment out the three lines, the configuration validation pass.
What am I missing here?

binary_sensor.*_contact:
  icon: mdi:walk
  device_class: motion

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