Using a Cognito custom attribute as a principal tag in an IAM policy condition is not working

Question

Here's the setup: * **User Pool custom attribute:** `custom:journalSubscription` * **User Pool app client:** has read/write permission for the custom attribute * **Example user:** has custom attribute `custom:journalSubscription` set to `true` * **Identity Pool ABAC custom mapping:** "Attribute name" of `custom:journalSubscription` ---maps to---> "Tag key for principal" of `journalSubscription` * **IAM policy:** uses a condition for "StringEquals" where "aws:PrincipalTag/journalSubscription" must equal "true" **Problem:** the SDK call fails with this error: ``` User: <> is not authorized to perform: dynamodb:GetItem on resource: <> because no identity-based policy allows the dynamodb:GetItem action ``` **Note:** the SDK call works fine with an IAM policy that uses a condition for a non-custom attribute such as `"aws:PrincipalTag/email"`. It's just that for custom attributes, the call fails. How can I make this work?

Accepted Answer

In the app client settings, for the `OpenID Connect scopes`, add `profile`. This allows the app client to retrieve "profile" attributes which seems to include custom attributes.

Answer

seems to be

Using a Cognito custom attribute as a principal tag in an IAM policy condition is not working

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