If you receive Zoom error code 4502 and/or error code 3000, this means that an issue is preventing you from canceling an occurrence in a recurring meeting (error code 4502) or changing the settings of the meeting (error code 3000) with the Zoom Plugin for Microsoft Outlook.

How to fix it

Install the latest version of the Zoom plugin for Outlook

 If you are experiencing this issue, manually update to the latest version of the Outlook plugin.

Ensure an occurrence's time matches in Zoom and Outlook

If you have already updated the Zoom plugin for Outlook, and can't edit a Zoom meeting in Outlook, check the meeting occurrence you're trying to to delete or change. Ensure that that meeting occurrence matches the time that Zoom has on its web portal/client.

If the time does not match the Zoom web portal/client, manually change the Zoom occurrence time to match the Outlook time.

Add a space to the occurrence title in Outlook

If you can't update an Outlook meeting instance, perform the following troubleshooting steps.

1. Open the Zoom recurring meeting in the Outlook application (not through the web).
2. In the Zoom recurring meeting (all), add a space to the meeting title.
3. Click Save to update the recurring meeting. 
4. Access the individual occurrence of the recurring meeting that you want to reschedule.
5. Edit and reschedule the individual occurrence.

Note: Ensure that you send this meeting via the Outlook plugin to resolve inconsistencies.

General troubleshooting steps

If the issue persists, perform the following troubleshooting steps.

1. Edit the calendar invites where the issue was observed.
2. Upgrade Outlook 365 to the latest version.
3. Run the Clean Zoom tool to uninstall-reinstall the Zoom plugin for Outlook.