title: Connect Unauthenticated Federated Identity ID with User Pool
body: <p>I'm trying to implement an option in Mobile app (Xamarin) for users to be able to login into App as a guest user.</p>
  
  <p>Right now I'm able to obtain the Federated Identity ID for a guest user. It has a form of AccessKey/SecretKey/Token. </p>
  
  <p>I'm struggling with translating that credentials to accesToken and refreshToken that I get from users, who are generated via user pool. </p>
  
  <p>What could be your suggestions?   </p>