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Error by updating a Planner task with label when SharePoint item is modified

I have a flow to update a planner task when a SharePoint item is modified. The flow gives an error when I want to add a label based on a variable.


First I make the variable (FinalAssignedTo) based on the AssignedTo, then I make the outcome for the label based on the expressoin  "if(contains(variables('FinalAssignedTo'), ''), 'true', 'false')"




Then I update the Planner task with the outcome from the label.




I get the following error message: "An open type property has an invalid type."


I have the same situation in a flow "New SharePoint item -> Make Planner task". In this flow it is working correct.

Can someone help me to solve this issue?


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