Webhook Sync Issue — Acuity Integration Not Updating or Creating Zoom Meetings

API and Webhooks Meetings
1

We’re experiencing a recurring issue with the Acuity Scheduling → Zoom integration.
Certain meetings are either not being updated after a reschedule in Acuity, or not being created at all in the Zoom calendar.

The issue persists even after:

  • Reintegrating Acuity and Zoom,

  • Signing out/in again from both platforms, and

  • Testing multiple appointment types and users.

Observed Behavior

  1. Rescheduled appointments

    • When an appointment is moved to a new time in Acuity, the linked Zoom meeting remains at the old time.

    • It appears that Zoom is not receiving or processing the update webhook correctly.

  2. New appointments

    • In several cases, newly created Acuity appointments never generate a corresponding meeting in Zoom Calendar at all, even though they display a Zoom Meeting ID inside Acuity.

  3. Webhook delivery

    • Acuity’s internal “Changes & Communication” log shows no failed deliveries or errors.

    • This suggests that the webhook is being sent, but possibly not accepted or applied by Zoom’s API.

Environment

  • Acuity Scheduling integration (native Zoom integration, not a custom app)

  • Zoom Calendar and Meetings

  • Behavior observed consistently across multiple teacher accounts

  • No user-side API changes or webhook modifications have been made

Expected Behavior

  • When an appointment is rescheduled in Acuity, the corresponding Zoom meeting should update automatically.

  • When a new appointment is created, a new Zoom meeting should be created and reflected in the connected Zoom Calendar.

Additional Notes

  • Acuity’s Product Specialist team is already investigating on their end and has confirmed the issue appears on the webhook transmission or processing layer.

  • We’re coordinating findings between both sides to determine if the issue lies in Zoom’s webhook endpoint handling or event update logic for meetings that reuse existing IDs.

  • The issue impacts multiple users and time zones (Europe/Brussels).

Request

Could your team please:

  1. Verify whether Zoom’s webhook/API logs show any dropped or unprocessed update events for Acuity integrations.

  2. Confirm if there are any known issues with reused meeting IDs or update webhooks from third-party scheduling systems (like Acuity Scheduling).

Thank you very much for your help. This issue is significantly impacting live class scheduling for our organization.

Lynn M.