roleArn

The Amazon Resource Name (ARN) of the role that the caller is assuming.

Additional considerations apply to Amazon Cognito identity pools that assume cross-account IAM roles. The trust policies of these roles must accept the cognito-identity.amazonaws.com service principal and must contain the cognito-identity.amazonaws.com:aud condition key to restrict role assumption to users from your intended identity pools. A policy that trusts Amazon Cognito identity pools without this condition creates a risk that a user from an unintended identity pool can assume the role. For more information, see Trust policies for IAM roles in Basic (Classic) authentication in the Amazon Cognito Developer Guide.