title: Cannot retrieve a list of campaigns for some accounts
body: <p>I'm experiencing troubles requesting list of campaigns for some accounts. I'm requesting data with C# SDK , and my query is pretty simple: <code>/v2.2/act_&lt;account id&gt;/adcampaign_groups</code>.</p>
  
  <p>For some accounts this works fine, but for some it returns OAuthException #10 (You do not have sufficient permissions to perform this action). </p>
  
  <p>The result is the same when using Graph Explorer, so it doesn't seem like SDK issue. I also get the same error when requesting <code>/v2.2/act_&lt;account id&gt;</code>. But I see this account with all its properties when requesting <code>/v2.2/me/adaccounts</code>.</p>
  
  <p>I have administrator permissions in ads cabinet, and I can see campaigns for these faulty accounts in web UI, so I don't see any reason why it shouldn't work.</p>
  
  <p>Any help?</p>