Issue with Scheduling Callback via Zoom API

API and Webhooks
1

Hi Team,

I am attempting to schedule a callback from my Zoom account using the API. I have prior experience working with Zoom APIs and have successfully executed multiple API calls in the past. However, I am currently facing an issue specifically with scheduling a callback.

When I attempt to create a scheduled callback, I receive the following error response:

{
    "code": 300,
    "message": "Invalid value for field 'null': invalid type"
}

Based on the documentation, this error indicates that one of the fields in the request may have an incorrect format or data type. However, I have reviewed my request and believe it follows the required structure.

Please find the request details below:

Endpoint:
https://api.zoom.us/v2/contact_center/queues/ZWQC647829DDA8E5E9235F498C778157CEE/scheduled_callbacks/events

Method: POST
Content-Type: application/json

Request Body:

{
  "start_time": "2026-04-17T15:00:00Z",
  "attendees": [
    {
      "first_name": "Vignesh",
      "last_name": "Chellamani",
      "phone_number": "+916369748867",
      "email": "acvignesh22@gmail.com"
    }
  ]
}

I am using the following Queue ID:
ZWQC647829DDA8E5E9235F498C778157CEE

Below are the details retrieved for this queue:

{
    "queue_id": "ZWQC647829DDA8E5E9235F498C778157CEE",
    "cc_queue_id": "tbb85R2AT6aITy4hIpLwcw",
    "queue_name": "Zoomly Schedule Callback",
    "channel_types": [
        "voice"
    ],
    "channel": "voice",
    "agents_count": 3,
    "supervisors_count": 0,
    "modified_by": "QIdCXmnhREmoPzqlZViALw",
    "last_modified_time": "2025-09-12T08:40:46Z"
}

I have shared all the relevant details above for your reference. Could you please review my API request and confirm whether the request format or parameters are incorrect?

Your assistance in resolving this issue would be greatly appreciated. Please let me know if any additional information is required.

Thank you for your support.

Best regards,
Santhosh

2

Thank you for posting, @Santhosh1 ! As a test, can you remove the plus sign (+) from the phone number and share the results? Also, I noticed you entered 12 digits. Is that the correct length for the country associated with that number?