Getting 400 on an API request constructed from the docs

I’m using the builder here:

and everything is “green” on my inputs, but I get an error response (below) that the message param is badly formatted. Any ideas?

Here you can see I am inputting a simple string as the message.

here is the error: 

  'errors': [
      'status': 400,
      'source': {
        'pointer': '/reference/message'
      'code': 'badparam',
      'title': 'Format validation failed (invalid)'

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