Customer raises an issue stating the linked / related incidents are not being moved to a resolve state when the master incident is resolved. What could be the issue?

Service Desk Incident Management
1

The state ids configured under the setting key ‘Linked Record End State for Related Incidents’ may not be proper / blank. Please check the setting keys ‘Linked Record End State for Related Incidents’ against the other setting key ‘Linked Record End State for Master Incident’.