# Last\_name is required when adding Registrant **URL:** \ **Category:** API and Webhooks\ **Created:** [December 20, 2021, 3:48am UTC](https://devforum.zoom.us/t/last-name-is-required-when-adding-registrant/61647 "2021-12-20T03:48:20Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![cfo](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/cfo/32/33444_2.png) [@cfo](https://devforum.zoom.us/u/cfo)\ **Post date:** [December 20, 2021, 3:48am UTC](https://devforum.zoom.us/t/last-name-is-required-when-adding-registrant/61647/1 "2021-12-20T03:48:20Z")
## Using this template helps us debug your issues more effectively 🙂 **Description** A clear and concise description of what the question is. Error given Last\_name is required when adding Registrant. Why suddenly Last\_name is mandatory? We don’t encounter such issue until 19 Dec 2021. I checked that there is no changes on the API at [https://marketplace.zoom.us/docs/api-reference/zoom-api/meetings/meetingregistrantcreate](https://marketplace.zoom.us/docs/api-reference/zoom-api/meetings/meetingregistrantcreate). **Error** The full error message or issue you are running into. “{“code”:300,“message”:“The parameter is required: last\_name.”}” **Which App Type (OAuth / Chatbot / JWT / Webhook)?** Knowing the endpoint/s can help us to identify your issue faster. Please link the ones you need help/have a question with. JWT **Which Endpoint/s?** Knowing the API endpoint/s can help us to identify your issue faster. Please link the ones you need help/have a question with. [https://api.zoom.us/v2/meetings/{meetingid}/registrants](https://api.zoom.us/v2/meetings/%7Bmeetingid%7D/registrants) **How To Reproduce (If applicable)** Steps to reproduce the behavior: 1. Request URL / Headers (without credentials) / Body 2. See error **Screenshots (If applicable)** If applicable, add screenshots to help explain your problem. **Additional context** Add any other context about the problem here. ---
**Author:** ![amit3](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/amit3/32/3259_2.png) [@amit3](https://devforum.zoom.us/u/amit3)\ **Post date:** [December 20, 2021, 6:59am UTC](https://devforum.zoom.us/t/last-name-is-required-when-adding-registrant/61647/2 "2021-12-20T06:59:07Z")
Hi We Facing same issue while start meeting we getting "StatusCodeError: 400 - {\\\“code\\\”:300,\\\“message\\\”:\\\"The parameter is required: last\_name.\ ---
**Author:** ![andries](https://avatars.discourse-cdn.com/v4/letter/a/e56c9b/32.png) [@andries](https://devforum.zoom.us/u/andries)\ **Post date:** [December 20, 2021, 11:04am UTC](https://devforum.zoom.us/t/last-name-is-required-when-adding-registrant/61647/3 "2021-12-20T11:04:16Z")
same here, suddenly last\_name is required field when registering new attendees. ---
**Author:** ![BetterMynd](https://avatars.discourse-cdn.com/v4/letter/b/278dde/32.png) [@BetterMynd](https://devforum.zoom.us/u/BetterMynd)\ **Post date:** [December 20, 2021, 4:37pm UTC](https://devforum.zoom.us/t/last-name-is-required-when-adding-registrant/61647/4 "2021-12-20T16:37:59Z")
Exact same issue. Is this being worked on? Is there an ETA on a fix? Or is this a breaking change that wasn’t communicated? Thanks! ---
**Author:** ![wcarle](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/wcarle/32/20534_2.png) [@wcarle](https://devforum.zoom.us/u/wcarle)\ **Post date:** [December 20, 2021, 6:11pm UTC](https://devforum.zoom.us/t/last-name-is-required-when-adding-registrant/61647/5 "2021-12-20T18:11:44Z")
Same issue here, we had to deploy an emergency fix over the weekend because of the unannounced change. Please alert us to breaking changes in advance ---
**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 20, 2021, 6:38pm UTC](https://devforum.zoom.us/t/last-name-is-required-when-adding-registrant/61647/6 "2021-12-20T18:38:39Z")
Hi All, Thank you for your patience; our team is looking into this right now. It seems like a breaking change related to some updates. Take a look here: [https://marketplace.zoom.us/docs/guides/stay-up-to-date/changelog#publications/api-updates-december-20-2021](https://marketplace.zoom.us/docs/guides/stay-up-to-date/changelog#publications/api-updates-december-20-2021) Ctrl+F for “last name” to see the affected endpoints. Gianni ---
**Author:** ![pkarthik2391](https://avatars.discourse-cdn.com/v4/letter/p/f14d63/32.png) [@pkarthik2391](https://devforum.zoom.us/u/pkarthik2391)\ **Post date:** [December 21, 2021, 2:47pm UTC](https://devforum.zoom.us/t/last-name-is-required-when-adding-registrant/61647/7 "2021-12-21T14:47:23Z")
@gianni.zoom Can you please confirm if this getting fixed or we need to modify our integration? This is breaking our entire production registration process. ---
**Author:** ![dev.plat.dk](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/dev.plat.dk/32/33524_2.png) [@dev.plat.dk](https://devforum.zoom.us/u/dev.plat.dk)\ **Post date:** [December 22, 2021, 6:52am UTC](https://devforum.zoom.us/t/last-name-is-required-when-adding-registrant/61647/8 "2021-12-22T06:52:40Z")
We agree with pkarthik2391. Please confirm if you will be fixing this or not. In our case we were using a space (’ ') for the last\_name, and now we are experiencing the error. Our production servers were affected, so we have temporarily replaced ’ ’ with ‘さん’ . ---
**Author:** ![meyyappan](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/meyyappan/32/13204_2.png) [@meyyappan](https://devforum.zoom.us/u/meyyappan)\ **Post date:** [December 28, 2021, 9:39am UTC](https://devforum.zoom.us/t/last-name-is-required-when-adding-registrant/61647/9 "2021-12-28T09:39:19Z")
@gianni.zoom Merry Christmas. Could you please help here with an update? ---
**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 28, 2021, 10:36pm UTC](https://devforum.zoom.us/t/last-name-is-required-when-adding-registrant/61647/10 "2021-12-28T22:36:34Z")
Hi all, This bug is still in progress for a fix. The ticket is ZOOM-333487 and we hope to have updates soon! Thank you, Gianni ---
**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 29, 2021, 2:52pm UTC](https://devforum.zoom.us/t/last-name-is-required-when-adding-registrant/61647/11 "2021-12-29T14:52:00Z")
Hi All, So this has been identified as a breaking change and going forward last\_name will continue to be required for these endpoints. Zoom will be more proactive about being more clear about breaking changes going forward to preserve the efforts of all of you using our APIs. Thank you, Gianni ---
**Author:** ![akterhossan154](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/akterhossan154/32/33579_2.png) [@akterhossan154](https://devforum.zoom.us/u/akterhossan154)\ **Post date:** [January 3, 2022, 4:40pm UTC](https://devforum.zoom.us/t/last-name-is-required-when-adding-registrant/61647/12 "2022-01-03T16:40:16Z")
Here, too, the last-name field is suddenly needed when registering a new visitor. If you would like to attend a meeting anonymously on Zoom, join the meeting without logging in to your account. When you join a meeting as a guest, Zoom asks for your name. And you can enter any of your names. You can even become a Wizard of Oz, or Mr. ---
**Author:** ![will.zoom](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/will.zoom/32/14417_2.png) [@will.zoom](https://devforum.zoom.us/u/will.zoom)\ **Post date:** [January 4, 2022, 8:59pm UTC](https://devforum.zoom.us/t/last-name-is-required-when-adding-registrant/61647/13 "2022-01-04T20:59:45Z")
Closed on January 4, 2022, 8:59pm UTC