Formula to lookup and display date based on specific task


I need to report a GO Live date on various dashboards. The problem is the go live date is not in a static row and can move up or down in the project plan based on tasks. I assumed that I could use the vlookup to find the "Go live" task and display the date but using this formula, nothing displays. I dont get an error of any kind, the summary field is just blank.

=VLOOKUP("NOC Go Live", [Task Name]:[Actual Finish], 3)


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