Object workflow is not triggering email notifications - Milestones

Summary:

Custom object workflow is not triggering email notifications for the Milestone object.

Content (please ensure you mask any confidential information):

We are using the standard Milestone object with the Resolution Metric and Created Coverage configurations. The Resolution Metric includes the result columns Calendar and Category, and the milestones are being triggered successfully.

A workflow has been configured with the following condition:

if (isAttributeChanged("ComplianceFlag") && ComplianceFlag == 'N')

return true ;

The workflow is expected to trigger an email notification when the condition evaluates to True.

However, after the Monitor Service Request Milestones job runs, the ComplianceFlag field is correctly updated in the backend with the value 'N', but the workflow is not triggering the email notification as expected.