title: AWSMobileHubHelper DynamoDB AccessDeniedException
body: <p>I'm using the <code>Swift AWS Mobile Hub Helper</code> to build my iOS app and connect to my <code>DynamoDB</code> database. I can see that after logging in using a <code>Facebook SignInProvider</code> I'm getting an assumed role arn for an authorized role for the table I'm trying to connect to, but when I try to use the load method on my <code>DynamoDBObjectMapper</code> I get an error telling like this:</p>
  
  <blockquote>
    <p>is not authorized to perform: dynamodb:GetItem on resource </p>
  </blockquote>
  
  <p>I tried downloading a new base app from the mobile hub page and making no other alterations but to point it to the new table but it had the same error. My colleague is building an android version of our app and he is able to connect to the database and he says that he made no changes to how he connects so I'm unsure as to what is causing the error.</p>
  
  <p>EDIT: I've been looking at the federated identity pool that I'm ostensibly being assigned and the identity id that cognito is assigning my device (the simulator) is appearing there if I search for it with the dataset that my code is creating.</p>