An application already has an IAM role but a request is blocked by a matching applicable deny policy. Adding another allow binding did not help. Which approach best fits?

1. Restrict federation using validated token attributes and narrowly scoped IAM bindings.
2. Evaluate the deny policy and its exceptions rather than adding more allow grants.
3. Define and maintain a custom IAM role with the necessary supported permissions.
4. Apply the supported organization-policy restriction on service-account key creation.