Action "Post a feed notification" returns "The response is not in a JSON format."

[mschafer85]

Hi community!

It all started out with me wanting to use the template "Follow up on a message": https://powerautomate.microsoft.com/en-us/templates/details/34df10b7d2824b12a23f3a0c50869f99/follow-...

For some users, this flow failed. The failing action was "Post a feed notification" and the error message "The response is not in a JSON format":

However, this was only the case for some users. I suspected that it might have to do with the language settings (as you can see in the screenshot above, the issue comes up for a French user - but for German users it worked fine).

So I tried to reproduce it on a demo tenant: For the admin user, it worked fine, but for two English test users, it failed with the same error message.

Then, I tried to set up a minimal example with one of these test users:

However, this also failed:

The contents:

{
  "error": {
    "code": 400,
    "source": "europe-002.azure-apim.net",
    "clientRequestId": "1d59f9ce-bdd2-4b1a-948a-02cc0726bd61",
    "message": "The response is not in a JSON format.",
    "innerError": "Cannot read server response."
  }
}

{
  "Pragma": "no-cache",
  "x-ms-request-id": "westeurope:7458d265-b522-4157-a921-b8865382ff54",
  "x-ms-correlation-request-id": "7458d265-b522-4157-a921-b8865382ff54",
  "x-ms-flow-mobile-ios-version": "1.3.0",
  "x-ms-flow-routing-request-id": "WESTEUROPE:20220307T060248Z:7458d265-b522-4157-a921-b8865382ff54",
  "Strict-Transport-Security": "max-age=31536000; includeSubDomains",
  "X-Content-Type-Options": "nosniff",
  "Timing-Allow-Origin": "*",
  "x-ms-apihub-cached-response": "false",
  "x-ms-apihub-obo": "true",
  "Cache-Control": "no-cache",
  "Date": "Mon, 07 Mar 2022 06:02:47 GMT",
  "Content-Length": "256",
  "Content-Type": "application/json",
  "Expires": "-1"
}

So, to me, this seems like an issue with the action "Post a feed notification".

Does anyone have any ideas?

[jinivthakkar]

@mschafer85 the json is broken, please check if JSON is valid on http://jsonviewer.stack.hu/

found a similar thread here

https://powerusers.microsoft.com/t5/General-Power-Automate/Error-The-response-is-not-in-a-JSON-forma...

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[mschafer85]

Hello @jinivthakkar,

thanks for your response!

But the JSON seems correct - the very same message works for a different user.

Meanwhile it seems like we might have figuered it out, though: The action "Post a feed notification" seems to work for users which have the "Power Automate" app installed in Teams.

As soon as I add this app ...

... the JSON error disappears and the notification goes through.

Can anyone confirm this behaviour? I haven't found this limitation yet: https://docs.microsoft.com/en-us/connectors/teams/#known-issues-and-limitations

[landonjochim]

If you are having trouble with the "The response is not in a JSON format" error. Read this:
https://powerusers.microsoft.com/t5/Building-Flows/Solution-How-to-use-the-MS-Teams-Post-a-Feed-Noti...