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