# Zoom.Mtg.Join UserEmail must be unique

**URL:** <https://devforum.zoom.us/t/zoom-mtg-join-useremail-must-be-unique/54767>\
**Category:** Web\
**Created:** [July 27, 2021, 7:01am UTC](https://devforum.zoom.us/t/zoom-mtg-join-useremail-must-be-unique/54767 "2021-07-27T07:01:58Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![meetmatt](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/meetmatt/32/16401_2.png) [@meetmatt](https://devforum.zoom.us/u/meetmatt)\
**Post date:** [July 27, 2021, 7:01am UTC](https://devforum.zoom.us/t/zoom-mtg-join-useremail-must-be-unique/54767/1 "2021-07-27T07:01:58Z")

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**Description**  
How can prevent user from joining using same email?

**Which Web Client SDK version?**  
1.9.6

**Additional context**  
Add any other context about the problem here.

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**Author:** ![MaxM](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/maxm/32/42303_2.png) [@MaxM](https://devforum.zoom.us/u/MaxM)\
**Post date:** [July 28, 2021, 6:37pm UTC](https://devforum.zoom.us/t/zoom-mtg-join-useremail-must-be-unique/54767/2 "2021-07-28T18:37:48Z")

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Hey @meetmatt,

Thank you for reaching out to the Zoom Developer Forum. The best way is to check the email the participant entered before they join. You can keep a list of emails for participants that have joined and check against that or use SDK functions `ZoomMtg.getAttendeeList()`

or Webhooks like `meeting.participant_joined` to keep track of participants.

Let me know if that helps.

Thanks,  
Max

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**Author:** ![system](https://us1.discourse-cdn.com/flex016/uploads/zoomdeveloper/original/3X/6/1/614bdd549b610bbaa46ff934617683a02bdaa03c.png) [@system](https://devforum.zoom.us/u/system)\
**Post date:** [August 28, 2021, 4:37am UTC](https://devforum.zoom.us/t/zoom-mtg-join-useremail-must-be-unique/54767/3 "2021-08-28T04:37:54Z")

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Closed on August 28, 2021, 4:37am UTC

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