Input helper number not a float?

Configuration
11

data_template was deprecated in favor of data several versions ago.
data now serves the same function as data_template did.

No, in fact the double-quotes are required otherwise, without them, the entire line will be reported as an error.

The error message is complaining about volume_level expecting a float value but it failed to receive one. That’s obvious from here:

  - service: media_player.volume_set
    data:
      volume_level: input_number.google_home_volume. <---- This
    entity_id: media_player.google_home_study

m0wlheld had the right idea, just overlooked to wrap the template in double-quotes.

  - service: media_player.volume_set
    data:
      volume_level: "{{ states('input_number.google_home_volume') }}"
    entity_id: media_player.google_home_study
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