Hi there @Pulkit Singhal 

 In older versions where this functionality might not be available, the `guest` user specification is typically used as an alternative.

If you're using an older version of ServiceNow and the `user` context is not supported in Client Credentials-based authentication, you can consider using the `guest` user instead. The `guest` user is a built-in user account in ServiceNow that is often used for unauthenticated or anonymous access. It provides limited access to certain functionalities based on configured permissions.

If this helps kindly accept the response thanks much.