Clarification on Namespace Behavior in RoleBindings and CSRs

Hi Team , As I am new to Kubernetes, I have a clarification regarding RoleBindings. When I created a CertificateSigningRequest (CSR) along with a Role and RoleBinding, I noticed that the namespace field in the RoleBinding’s Subjects section is empty, even though I specified the correct namespace while creating the user, Role, and RoleBinding. Is this the expected behavior? Should the namespace also be added to the CSR object? I believe adding a namespace to the CSR object might not be relevant. Could you please advise? Thanks , Sam