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How to find out what User completed a Planner task?

I am trying to post a message in Teams to show that a specific task has been completed by the user who closed a Task in Planner. Does anyone know the variable I can use to accomplish this? Currently there is no content for user who completed a task. 




@HonzaUH Of course this is it 🙂 Now it indeed "works like a charm". Many thanks to you and @Anonymous  for taking the time to help another noob!

New Member

It works perfect for me! Thank you.


Best regards,


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@GabrielStJohn ,


As the original user is no longer a part of this forum, would an admin be able to accept @HonzaUH's response as the solution?


It is exactly the solution for the problem presented.


thank you,


Frequent Visitor

I ran into this issue as well and used an expression to lookup the user so I could pull the display name in just a couple short steps. I wrote a step-by-step guide and recorded a video as well to help others:

Blog post step-by-step: 

Video recording: 

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