title: FB Graph API Exception Status: : The 'manage_pages' permission must be granted before impersonating a user's page
body: <p>I get the following response using the FB Graph API like so:</p>
  
  <p>Request:
  <a href="https://graph.facebook.com/v3.1/someId123/insights/page_impressions_unique/day?since=" rel="nofollow noreferrer">https://graph.facebook.com/v3.1/someId123/insights/page_impressions_unique/day?since=</a>{date.add(-90).format()}&amp;until={date.today}</p>
  
  <p>Rersponse:
  Service responded with exception status (400): {"error":{"message":"The 'manage_pages' permission must be granted before impersonating a user's page.","type":"OAuthException","code":190,"fbtrace_id":"abc123"}}</p>
  
  <p>This happens even though I have site admin rights and weirdly enough only with some pages while others work just fine.</p>
  
  <p>How can I check that I indeed (don't) have 'mange_pages' rights?</p>