Completion Configure Criteria

Summary:
Completion Configure Criteria

Content (please ensure you mask any confidential information):

Need help to understand how the completion configure criteria will work in Journeys

We have a requirement to throw an error message when employee try to add the emergency contact other than Spouse and selected the Discount holder flag (Discount holder is a DFF field).

Created an Onboarding type Journey and added the below condition in Configure Completion criteria,

Business Object: Worker Contact Relationship

Object criteria : ((( CONTACT_TYPE != 'S' )))
Error Message: Error

But i am not getting any error when i try to complete the Journey. Did i miss any configuration setup?