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Power Platform Community / Forums / Power Automate / Assistance Please: Pr...
Power Automate
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Assistance Please: Property selection is not supported on values of type 'String'

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Please assist. I think it has something to do with the ClientName in Update a Row. 
Action 'Update_a_row' failed: Unable to process template language expressions in action 'Update_a_row' inputs at line '0' and column '0': 'The template language expression 'outputs('Compose_-_Matched_Map_Row')?['ClientName']' cannot be evaluated because property 'ClientName' cannot be selected. Property selection is not supported on values of type 'String'.

Here’s what happened: The flow tried to use information from the "Compose - Matched Map Row" step, but it was expecting a special value called "ClientName" and only got a plain text instead. This caused the "Update a row" step to stop.
How to fix: 1.Switch to Edit mode in your flow. 2.Find the "Update a row" action. 3.Check the value used for "ClientName"—make sure it comes from a step that outputs a list or object, not just text. 4.Adjust the input so it uses the correct data source. 5.Save and test your flow.
 
 
 
 
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  • David_MA Profile Picture
    13,995 Super User 2026 Season 1 on at
    What you will need to do will depend on some things, but the key to fixing it is in this that you found: make sure it comes from a step that outputs a list or object. It appears you are using the output of the filter array action in the update a row action. The error stems from using an array to update one row. Add an apply and point it to the values from the filter array action. Then add the update row action within the apply to each.

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