AWS : Invalid identity pool configuration. Check assigned IAM roles for this pool

Check that the role you have assigned in Cognito Identity Pools (Federated Identities), has a trust relationship with the identity pool.

Get the identity pool ID + the name of the role that isn't working. To do this:

• Go to Cognito
• Select Manage Federated Identities
• Select the identity pool
• Click Edit identity pool (top right)
• Make a note of the identity pool ID
• Make a note of the name of the role that isn't working (e.g. Cognito_blahUnauth_Role

In IAM, check the trust relationship for the role. Ensure that the StringEquals condition value matches the identity pool ID.

To do this:

• Go to IAM
• Click Roles
• Click the name of the role that you noted previously
• Click Trust relationships
• On the right under Conditions, check the StringEquals condition contains the identity pool Id that you noted previously.

Edit the trust relationship to fix.

What you're trying to access here are "Cognito Federated Identity" credentials, which is a separate AWS product to "Cognito User Pools". In-order to retrieve these credentials, you need to connect your User Pool to your Federated Identity Pool.

Perhaps this link will help: http://docs.aws.amazon.com/cognito/latest/developerguide/amazon-cognito-integrating-user-pools-with-identity-pools.html

Also, I would remove admin access from Unauthenticated permissions, it means anyone with your details has control of your AWS account.