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Power Platform Community / Forums / Power Automate / How can I notify a Sla...
Power Automate
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How can I notify a Slack channel through Power Automate flows?

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I'm creating a flow to notify members of a Slack channel whenever a Box file in a folder is modified. However, when I wrote "@channel Please see the updated files." in the Post message element, I get the error message:

 

"The input parameter(s) of operation 'Post_message_(V2)' contains invalid expression(s). Fix invalid expression(s) for the input parameter(s) of operation 'Post_message_(V2)'."

 

Is there a valid expression for tagging channel members like this and if so, what is it?

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  • lbendlin Profile Picture
    8,479 Super User 2025 Season 2 on at
    This works for us:
     

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