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Does this help - https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_examples_dynamodb_items.html
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OK. I am not aware of how to accomplish this without using Cognito Identity Pools. This blog explains how you can use Cognito Identity Pools with Cognito User Pools to achieve fine-grained authorization - https://aws.amazon.com/blogs/mobile/building-fine-grained-authorization-using-amazon-cognito-user-pools-groups/
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Thanks for your reply. "${cognito-identity.amazonaws.com:sub}" doesn't work unless you are using the indentity pool id as the partition key. In my case Im suing the user pool sub as partition key.