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Power Automate - Building Flows
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How to find out what is causing a 400 Error

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Hi People.
 
I am trying to find out what is causing this error
 
 
Is there somewhere that will tell you what field is causing it?
My other flows which are the same are working but the difference with this list is it was created under an individual rather than a team.
I have full access to the list though, it is just coming from a different account. Not sure if that makes a difference.
 
Thanks 
 
  • Verified answer
    trice602 Profile Picture
    13,995 Super User 2025 Season 2 on at
    How to find out what is causing a 400 Error

    Hi there!

     

    Look at the out from your get items action.  Specifically look at item 2 (or any other item that failed).  Most likely you have a link, image, or attachment URL that is incorrect (or has spaces or special characters).

     

    You can also look at your Create Item action ~ again, you probably have a column that requires a valid URL and that's where it's failing.  So you could use an expression there instead of the direct dynamic content so if the URL is not accurate or empty, post nothing.

     

    if(
       or(empty(items('Apply_to_each')?['Link']),
          not(matches(items('Apply_to_each')?['Link'], '^https?://'))
       ),
       '',
       items('Apply_to_each')?['Link']
    )
     

     

     

    ------------------------------------------------

     

     

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    Tom

     

    Follow me on LinkedIn - Thomas Rice, PMP | LinkedIn

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