Error working with buttons in rasa IT helpdesk bot

Getting Started with Rasa
5

From https://rasa.com/docs/rasa/responses/#rich-responses:

ESCAPING CURLY BRACES IN DOMAIN.YML

You need to write the /intent{entities} shorthand response with double curly braces in domain.yml so that the assistant does not treat it as a variable in a response and interpolate the content within the curly braces.

The example on that page is:

responses:
  utter_greet:
  - text: "Hey! Would you like to purchase motor or home insurance?"
    buttons:
    - title: "Motor insurance"
      payload: '/inform{{"insurance":"motor"}}'
    - title: "Home insurance"
      payload: '/inform{{"insurance":"home"}}'