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Cannot `request` a public layer

See original GitHub issue

I’m on v2.0.0

I’m running into an ArcGISAuthError when trying to request a public MapServer layer.

request('https://sampleserver6.arcgisonline.com/arcgis/rest/services/USA/MapServer/2',
  {
    httpMethod: 'GET',
    authentication
  }
);

My UserSession’s portal property: https://qaext.arcgis.com/sharing/rest.

Result:

{
  "name": "ArcGISAuthError",
  "message": "NOT_FEDERATED: https://sampleserver6.arcgisonline.com/arcgis/rest/services/USA/MapServer/2 is not federated with any portal and is not explicitly trusted.",
  "originalMessage": "https://sampleserver6.arcgisonline.com/arcgis/rest/services/USA/MapServer/2 is not federated with any portal and is not explicitly trusted.",
  "code": "NOT_FEDERATED",
  "url": "https://sampleserver6.arcgisonline.com/arcgis/rest/services/USA/MapServer/2",
  "options": {
    "httpMethod": "GET",
    "params": {
      "f": "json"
    },
    "authentication": {
      "clientId": "KU6w5ji2TfnAx5gl",
      "username": "jpeterson_iot",
      "token": "U_HrpG0BBRwPxk17JENdPIvIvooLNGyJez-vYEPiw-w2cpedH9EvAtk1cFbZF-zdp1j2KrVxF23KmGvztgpDtPYuXvvRA1uXmHcIDGaHe9yT8uZqnsEYE6Q9GlCPwN9X5EAkkPZLc8mGv9iH8hiV96Z1863QPqX4JCMbQy9I8Q6m4GF8VH0mPXMxNKO37PzR1wRxCu-cc72Fbg8-g3KzFZ2QejrAFhNja6TfUheG_jk.",
      "tokenExpires": "2019-05-14T16:30:40.047Z",
      "portal": "https://qaext.arcgis.com/sharing/rest",
      "ssl": true,
      "tokenDuration": 20160,
      "refreshTokenTTL": 1440
    },
    "headers": {}
  }
}