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Error downloading csv file using REST API

I am trying to download a paginated report output as CSV using the REST APIs. I can successfully download the report results as PDF however it is not working when I am choosing to download the information as CSV. I suspect I might not be passing in the right values in the PaginatedReportExportConfiguration parameter.


I am first calling 'Export to File in Group' using the Group Id and Report ID as shown below:



I then check the status which shows the status of Succeeded.


Then I try to download the file, but I get this error 418 - Unsupported file type returned by PowerBI



The report is hosted in a Premium workspace. I am calling the APIs from a third party application by Appian. When I make this same calls from the Learn.Microsoft.Com REST API, it works. Any idea what is the problem with my calls?




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