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Links to single, non-recurring meetings are valid for 30 days from the scheduled time of the meeting. That means that even if the host "ends" the meeting, somebody with the link can still join it unless the "Join Before Host" option is disabled.
If you will be unable to attend the meeting and still want it to occur, you will need to designate an alternative host who will attend.
You can disable "Join Before Host" two ways.
When scheduling a meeting:
- Open the "Advanced Options"
- Make sure the checkbox by "Join Before Host" is deselected.
You can change your default meeting preferences to not allow join before host in meetings you host.
- Go to your "Settings" page in the portal: https://mit.zoom.us/profile/setting
- Turn off the "Join Before Host" option.
This will not update the settings of any meetings you have already scheduled. Those will need to be edited if you want this setting to apply to them. See: How do I Update a Scheduled Zoom Meeting?