Even the example from the help guide (yes, I did enter the API token) doesn't work:
curl https://api.intercom.io/articles -X GET -H 'Authorization:Bearer <Your access token>' -H 'Accept:application/json' -H 'Content-Type: application/json'
Returns the following error:
{"type":"error.list","request_id":"001iuuadd47ehouu9ndg","errors":[{"code":"unauthorized","message":"Access Token Invalid"}]}