Zoho CRM in Microsoft Power Automate Custom Connector

Zoho CRM in Microsoft Power Automate Custom Connector

Hi everyone,

I’m building a Power Automate flow that integrates Microsoft Bookings with Zoho CRM. The goal is to automatically create a meeting (event) in Zoho CRM whenever a new appointment is booked via Microsoft Bookings.

To achieve this, I created a Custom Connector in Power Automate:
Base URL: /crm/v2
Endpoint: /Events
Method: POST
Authentication: OAuth 2.0 using Zoho EU (https://accounts.zoho.eu/oauth/v2/token)
Scope: ZohoCRM.modules.ALL

In the connector’s test tab, I enabled Raw Body and used the following payload:

{

      "data": [

            {

            "Subject": "Consultation with John Doe",

            "Start_DateTime": "2025-08-12T10:00:00+02:00",

            "End_DateTime": "2025-08-12T10:30:00+02:00",

            "Description": "Booked via Microsoft Bookings"

            }

      ]

}


However, when I test the operation, I receive a 400 INVALID_REQUEST error from Zoho CRM with the message: "unable to process your request. please verify whether you have entered proper method name, parameter and parameter values."

The Headers of the error message is:

{

  "cache-control": "private,no-cache,no-store,max-age=0,must-revalidate",

  "content-length": "192",

  "content-security-policy": "default-src 'none';frame-ancestors 'self'; report-uri https://logsapi.zoho.com/csplog?service=crm",

  "content-type": "application/json;charset=UTF-8",

  "date": "Tue, 12 Aug 2025 10:14:26 GMT",

  "expires": "Thu, 01 Jan 1970 00:00:00 GMT",

  "pragma": "no-cache",

  "referrer-policy": "strict-origin",

  "strict-transport-security": "max-age=64072000; includeSubDomains; preload",

  "x-content-type-options": "nosniff",

  "x-download-options": "noopen",

  "x-frame-options": "SAMEORIGIN",

  "x-ms-apihub-cached-response": "true",

  "x-ms-apihub-obo": "false",

  "x-ms-dlp-ef": "-|-/-|-|-",

  "x-ms-dlp-gu": "-|-",

  "x-ms-dlp-re": "-|-",

  "x-ms-environment-id": "default-80ed74fa-8f44-4a36-9520-c03e719ed98a",

  "x-ms-mip-sl": "-|-|-|-",

  "x-ms-tenant-id": "80ed74fa-8f44-4a36-9520-c03e719ed98a",

  "x-xss-protection": "0; mode=block"

}

 

The Body of the error message is:

{

  "code": "INVALID_REQUEST",

  "details": {},

  "message": "unable to process your request. please verify whether you have entered proper method name, parameter and parameter values.",

  "status": "error"

}

 

I’ve confirmed the endpoint is /crm/v2/Events, the headers are correct (Content-Type: application/json, Accept: application/json), and authentication is successful.

What could be causing this error, and how can I resolve it?
Thanks a lot to anyone who can help!

Best, 
Martin