Rails + eventos de API de Google Calendar no creados

Creé la aplicación web rails. Cuando el usuario realiza algunas acciones, mi aplicación debe crear un nuevo evento en mi Google Calendar. Para mi tarea, elijo la autorización de servidor a servidor.

Escribí el siguiente código ruby:

  client = Google::APIClient.new({:application_name => "Rails calendar",
                         :application_version => "1.0"})

  keypath = Rails.root.join('config','google_secrets.p12').to_s
  key = Google::APIClient::PKCS12.load_key(keypath, "notasecret")

# generate request body for authorization
  client.authorization = Signet::OAuth2::Client.new(
      :token_credential_uri => 'https://accounts.google.com/o/oauth2/token',
      :audience             => 'https://accounts.google.com/o/oauth2/token',
      :scope                => 'https://www.googleapis.com/auth/calendar',
      :issuer               => '***',
      :signing_key          => key).tap{ |auth| auth.fetch_access_token! }


  api_method = client.discovered_api('calendar','v3').events.insert
  @meeting_data = {
      guests: [{email: '***@gmail.com'}, {email: '***@gmail.com'}],
      start_time: "2016-08-10T19:00:00+03:00",
      end_time: "2016-08-10T20:00:00+03:00",
      topic: "Test meeting",
      messages_thread_id: 2
  }

  event = {
      summary: @meeting_data[:topic],
      start: {
          dateTime: @meeting_data[:start_time],
          time_zone: 'Asia/Jerusalem'
      },
      end: {
          dateTime: @meeting_data[:end_time],
          time_zone: 'Asia/Jerusalem'
      },
      attendees: @meeting_data[:guests],
      visibility: 'private',
      reminders: {
          useDefault: true,
      }
  }

  result = client.execute(:api_method => api_method,
                          :parameters => {calendarId: 'primary'},
                          :body => JSON.dump(event),
                          :headers => {'Content-Type' => 'application/json'})

  puts result.data.as_json

Pero cuando trato de usar ese código y el servidor me devuelve el resultado como JSON, si voy a la URL del evento "creado", google me muestra un mensaje de que el evento no existe.

{"kind"=>"calendar#event", "etag"=>"***", "id"=>"***", "status"=>"confirmed", "htmlLink"=>"https://www.google.com/calendar/event?eid=***", "created"=>"2016-08-04T11:54:46.000Z", "updated"=>"2016-08-04T11:54:46.327Z", "summary"=>"Test meeting", "creator"=>{"email"=>"***", "self"=>true}, "organizer"=>{"email"=>"***", "self"=>true}, "start"=>{"dateTime"=>"2016-08-10T16:00:00Z", "timeZone"=>"Asia/Jerusalem"}, "end"=>{"dateTime"=>"2016-08-10T17:00:00Z", "timeZone"=>"Asia/Jerusalem"}, "visibility"=>"private", "iCalUID"=>"***", "sequence"=>0, "attendees"=>[{"email"=>"***@gmail.com", "displayName"=>"***", "responseStatus"=>"needsAction"}, {"email"=>"***@gmail.com", "displayName"=>"***", "responseStatus"=>"needsAction"}], "reminders"=>{"useDefault"=>true}}

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