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SRJPBI's avatar
SRJPBI
Frequent Visitor
4 months ago
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Power BI REST API - why does my cloud connector call fail with 'BadRequest'?

I have a Power BI report that's been published into the online service. It works fine. I now want to automatically extract data from a matrix within the report.   I have created a flow in Power Aut...
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  • v-ssriganesh's avatar
    v-ssriganesh
    4 months ago

    Hi SRJPBI,

    Thank you for sharing the details and the updated DAX query.

    Based on the official Microsoft documentation, the Execute Queries REST API requires a valid DAX query that returns a table, typically using a single EVALUATE statement. The query pattern you’re using (DEFINE / VAR with one EVALUATE) is valid DAX syntax.

    When using this API from Power Automate, a 400 BadRequest is commonly caused by request‑formatting issues rather than the DAX logic itself:

    • The DAX query is sent inside a JSON request body, so any double quotes inside the DAX (for example "IsGrandTotalRowTotal") must be escaped (e.g., \"IsGrandTotalRowTotal\") to keep the JSON valid.
    • Only the DAX query should be passed to the API; comments such as // DAX Query should be removed.

    Ensure the request body follows the documented format:

    {
  "queries": [
   { "query": "<DAX query text>" }
  ]
}

    In addition, please verify the documented prerequisites:

    • The Dataset Execute Queries REST API tenant setting is enabled.
    • The calling user has Read + Build permissions on the dataset.

    For troubleshooting, you can also test with a simpler SUMMARIZECOLUMNS query to confirm the API call succeeds before adding more complex logic.

    For your reference: Datasets - Execute Queries - REST API (Power BI Power BI REST APIs) | Microsoft Learn

    Best regards,
    Ganesh Singamshetty

v-ssriganesh's avatar
v-ssriganesh
Icon for Community Support rankCommunity Support
4 months ago

Hello SRJPBI, 

Could you please confirm if your query has been resolved by the provided solutions? This would be helpful for other members who may encounter similar issues.

 

Thank you for being part of the Microsoft Fabric Community.