Look up formula in workflow condition

[Mohd_Nur_Arief]

So i have a table called “Customer Acknowledgement” that is referred to a table called “Details” (Table “Customer acknowledgement” Is part of table “Details”). I’ve set a workflow to fire when column “status” from table “Customer Acknowledgement” is equal to “Completed” and the update event is set to UPDATES_ONLY. but im not sure why it is not triggering when i update the status of the customer acknowledgement

The formula is:
LOOKUP([_THISROW].[ID],“Customer acknowledgement”,“Customer Acknowledgement ID”,“Status”)=“Completed”