Overview:
There are no Monitored Subject records associated with a Monitoring Event in Vault CTMS.
Root Cause:
The Subject records that should be associated with Monitored Subject records are added after the Monitoring Event is moved to the In Progress state of the Monitoring Event lifecycle.
Solution:
The solution is to add all necessary Subject records to the Monitoring Event before moving it forward in the Monitoring Event lifecycle to the In Progress state.
Related Documentation:
Vault Documentation: Vault Help