Because the REST API was used for job creation and triggering runs, a Service Principal will be automatically used to identify these events.

Because User A created the jobs, their identity will be associated with both the job creation events and the job run events.

Because these events are managed separately, User A will have their identity associated with the job creation events and User B will have their identity associated with the job run events.

Because the REST API was used for job creation and triggering runs, user identity will not be captured in the audit logs.