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Power Automate Flow Error: Analyze Document Action Expects Body as Object, Not String

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Posted on 22 Feb 2025 12:19:59 by RT-22020119-0

Hello Power Automate Community,

I'm encountering an unexpected issue with my flow that was previously running without any problems. My flow uses the Analyze Document for Prebuilt or Custom models (v4.x API) action to process PDFs, but it now fails with the following error:

Error:
Action 'Analyze_Document_for_Prebuilt_or_Custom_models_(v4.x_API)' failed:
The API 'formrecognizer' returned an invalid response for workflow operation 'Analyze_Document_for_Prebuilt_or_Custom_models_(v4.x_API)' of type 'OpenApiConnection'.
Details: The API operation 'AnalyzeDocumentV40' requires the property 'body' to be of type 'Object' but is of type 'String'.

Flow Overview:

Trigger: Recurrence
Action 1: List files in a root folder
Action 2: Filter for PDFs
Action 3: For each PDF file:
- Extract JobID from filename
- Retrieve corresponding case data
- Get Content from PDF
- Analyze Document using Form Recognizer v4.x

JSON Snippet Being Passed:

Here's the JSON being used in the Analyze Document action:

Additional Troubleshooting:

To isolate the issue, I also tried using the file path from the filtered array as the input to the Analyze Document action,

Categories:

Business Process Flows

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Michael E. Gernaey 42,027 Super User 2025 Season 1 on 25 Feb 2025 at 04:45:12

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Power Automate Flow Error: Analyze Document Action Expects Body as Object, Not String

Hi,

I am not able to see the v4 in this environment, but for V3 it expects an object for the data.

Do you share what Property you are setting the string in? open the action and share that.

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