title: Cannot send messages using Messenger Send API even after mobile app asked for page_messages permission
body: <p>In my mobile app facebook login I'm asking for page_messages and page_messaging_subscription permissions.</p>
  
  <p>When I try to send a message to a test user from a Node.js server, I get this error: </p>
  
  <blockquote>
    <p>"(#100) Parameter error: You cannot send messages to this id"</p>
  </blockquote>
  
  <p>The id is a app scoped user ID and the request is a POST request issued to this endpoint:</p>
  
  <blockquote>
    <p><a href="https://graph.facebook.com/v2.6/me/messages?access_token=SOME_PAGE_TOKEN" rel="nofollow noreferrer">https://graph.facebook.com/v2.6/me/messages?access_token=SOME_PAGE_TOKEN</a></p>
  </blockquote>
  
  <p>Note: The user has not interacted with the page before.</p>