To ensure auditing users can access records in the Case_Issue__c junction object, the correct data permissions on related records must be established:
D . Read-Only access on Case and Issue__c. Users need read-only access to both Case and Issue__c objects to view associated Case_Issue__c junction object records properly. This is because access to junction object records in Salesforce is determined by the user's access levels to the parent records in a relationship.
Steps to configure access:
Navigate to Setup → Profiles or Permission Sets.
Select the profile or permission set of the auditing users.
Under Object Settings, adjust the permissions for Case and Issue__c to at least 'Read-Only'.
Ensure that users have visibility to the Case_Issue__c object itself.
This configuration allows users to view the details of cases and issues as they audit the junction object records.