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PowerAutomate, Create a new task -->The response is not in a JSON format.



I would like to create a new task in the planner directly from project.

Once I define the "Root Site URL" of my project and test the flow, I get following error message.

I tried to fix it but I'm lost...


Error details:

The response is not in a JSON format.


"error": {
    "message""The response is not in a JSON format.",
    "innerError""Cannot read server response."
Thank you:)
Community Support
Community Support

Hi Manuel13

The 404 error usually represents connection authorization.  Could u share your error details regarding "Root Site URL" of project? You could also check whether your connection credentials have right access to the plan project.



Best Regards,
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

Hi Johnny,


thanks for your feedback. The error details:




  "Content-Security-Policy""frame-ancestors 'self' * * * * * * * * * *;",
  "X-MS-InvokeApp""1; RequireReadOnly",
  "Cache-Control""max-age=0, private",
  "Date""Mon, 31 Jan 2022 11:42:37 GMT",
  "Expires""Sun, 16 Jan 2022 11:42:38 GMT",
  "Last-Modified""Mon, 31 Jan 2022 11:42:38 GMT"


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