# Issue retrieving webinar registrants

**URL:** <https://devforum.zoom.us/t/issue-retrieving-webinar-registrants/139806>\
**Category:** API and Webhooks\
**Tags:** api\
**Created:** [December 16, 2025, 8:40am UTC](https://devforum.zoom.us/t/issue-retrieving-webinar-registrants/139806 "2025-12-16T08:40:30Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Lucas\_Lyv](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/lucas_lyv/32/60153_2.png) [@Lucas\_Lyv](https://devforum.zoom.us/u/Lucas_Lyv)\
**Post date:** [December 16, 2025, 8:40am UTC](https://devforum.zoom.us/t/issue-retrieving-webinar-registrants/139806/1 "2025-12-16T08:40:30Z")

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**API Endpoint(s) and/or Zoom API Event(s)**

`/meetings/{meetingId}/registrants`  
`/webinars/{webinarId}/registrants`

**Description**  
I have a small issue with the Zoom API. When retrieving the participants of a webinar, one of them does not have a “last\_name” field. However, this field is required to join our meetings/webinars.

What’s even more confusing is that, when retrieving the participant list through your interfaces, the person does have a last name.

**Error?**  
Only first \_name attribute is available, it contains the lastname and the firstname concatenated

**How To Reproduce**  
I don’t know yet, issue happened on one registrant and webinar for now

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<div class="post-metadata">

**Author:** ![gianni.zoom](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/gianni.zoom/32/32523_2.png) [@gianni.zoom](https://devforum.zoom.us/u/gianni.zoom)\
**Post date:** [December 16, 2025, 8:02pm UTC](https://devforum.zoom.us/t/issue-retrieving-webinar-registrants/139806/3 "2025-12-16T20:02:25Z")

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Hi @Lucas_Lyv , if it’s just one user, do you know how they inputted those details? What was their entry point for registration?