This is due to job_queue_processes initialization parameter is set to zero and none of the Repository DBMS_SCHEDULER jobs are running.
Please execute the below in repository database.
alter system set JOB_QUEUE_PROCESSES=100 scope=both;
Depending on the work load we may need to increase the value.
Please execute the below in repository database.
alter system set JOB_QUEUE_PROCESSES=100 scope=both;
Depending on the work load we may need to increase the value.