AWS Cognito Invalid identity pool configuration

Check the "Trust Relationship" section of the role that is assigned to your Identity Pool, authentication users. Make sure you have policies defining access to your Cognito pool.

The easiest way to get the requirement policy statements is,

1. Edit the pool
2. Create new role for identity pool
3. In IAM edit this role to copy the policy statements
4. Add these Trust Relationships to your required existing role

After some digging I realized that you must add the RoleArn and AccountId to your credentials.

Even though most of the documentation out there mention this as being enough:

AWS.config.credentials = new AWS.CognitoIdentityCredentials({
    IdentityPoolId: 'us-east-1:xxxxx-a87e-46ed-9519-xxxxxxx',
});

This was not enough.

I had to do this:

AWS.config.credentials = new AWS.CognitoIdentityCredentials({
    IdentityPoolId: 'us-east-1:xxxxx-a87e-46ed-9519-xxxxx',
    RoleArn: 'arn:aws:iam::xxxxx:role/Cognito_xxxxUsersUnauth_Role',
    AccountId: 'xxxxxxxxx', // your AWS account ID
});

You must mention the ARN of your Role for your identity pool.

The only doc that mention it right is this one.

The wrong ones:

• http://docs.aws.amazon.com/AWSJavaScriptSDK/guide/browser-configuring.html

• https://mobile.awsblog.com/post/TxBVEDL5Z8JKAC/Use-Amazon-Cognito-in-your-website-for-simple-AWS-authentication

• https://blogs.aws.amazon.com/javascript/post/TxTUNTVES4AL15/Authentication-in-the-Browser-with-Amazon-Cognito-and-Public-Identity-Providers

Maybe I'm missing something but this is certainly confusing.

The most common reason for this error is your roles aren't set up to trust your identity pool. You should confirm that the identity pool id listed in your trust relationships matches the identity pool you are using.

More info on trust relationships in Amazon Cognito can be found in our developer guide.