How to add the if conditions to the absence notification title

Summary:

We need to customize the absence email notification title dynamically based on the absence type name. I’ve implemented the customization using the type name, but the rule execution failed with a system fault error.

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I tried both conditions: Both are failing

if (/task:task/task:payload/ns0:AbsencesApprovalsRequest/ns0:Typename = 'Initiate Termination') then concat('Pre Termination Approval', /task:task/task:payload/task:NotificationTitleKey) else (/task:task/task:payload/task:NotificationTitleKey)