What should Rob check if he is not prompted to choose between PMD and CodeScan record types?

The appropriate action for Rob would be to verify that both PMD and CodeScan record types are assigned to his profile or permission set. This is critical because access to specific functionalities in Salesforce often depends on the configuration of user profiles and associated permission sets. If these record types are not assigned, Rob won't be able to see the options to choose between them, which directly impacts his ability to utilize the tools effectively.

When record types are available and correctly assigned to a profile or permission set, users should be presented with the choice to work with either PMD or CodeScan, facilitating a smoother workflow when reviewing code quality and compliance. Without this assignment, the feature is essentially hidden from the user, leading to confusion about its availability.

In contrast, while having full access to all SCA objects, ensuring CodeScan is enabled, or verifying the Salesforce license type may be important for other reasons, they do not directly impact the visibility of record types within the user interface. Thus, checking the assignment of the record types is the most relevant step for Rob's situation.