Error with Zoom API pagination

API Endpoint(s) and/or Zoom API Event(s)
Link the API endpoint(s) and/or Zoom API Event(s) you’re working with to help give context.

v2/webinars/<webinar_id>/registrants/
v2/past_webinars/<webinar_id>/participants/

Description
Details on your question, workflow or the problem you’re trying to solve.
By default a list of 30 registrants and a token to the next page is received. I found a bug that the following pages may have duplicate webinar members.
If you change page_size to 300, then if the members are less than 300, the list will be without duplicates
Error?
When you go through the pagination, duplicate webinar members appear

How To Reproduce
Steps to reproduce the behavior:
1. Import members (100-200) to webinar (without duplicates) (Registered is required)
2. Try v2/webinars/<webinar_id>/registrants/ for example with page_size=10
3. Notice duplicates on next pages.

hi @IlyaUrubleuski

I see you have repeated this question.

How are you importing the members?

If you look in Zoom.us are the imports correct?

all the best

John

hi @expertswho

I imported them via csv import in
Webinars → My Webinars → Invitations → Manage Attendees → Import from CSV

Yes, I see them all correctly, without duplicates, but when I send requests to get them I see duplicates.

all the best

Ilya

I faced this problem too. It seems happened on early April.
Checked that if the no. of registrants is larger than the page_size, the record will be duplicated on the other pages during taken with next_page_token.

I am struggling on that and I can’t do anything with API.
Would you please help to fix it? Thanks.

Hey @kevinchung and @IlyaUrubleuski
Thanks for bringing this up to our attention.
Would any of you be able to share some examples with me so I can report this to our Engineering team. I would need the the response you are getting and the tracking ID of the request (you can find this value in the response headers)

Hi Elisa, as the list is imported by using ‘Import from CSV’ and I didn’t create the source tracking ID, is that I can provide you the webinar ID for checking?
Thank you very much.

@elisa.zoom I am having same issue. Endpoint /v2/webinars/<id>/registrants
User with Id S328dumeRcGXPP4C1xxiFQ appears in both pages

Page 1
x-zm-trackingid: v=2.0;clid=aw1;rid=WEB_d168cda8773a57cc30dbc58a0b538373

{
    "page_size": 30,
    "total_records": 205,
    "next_page_token": "5tmjUbI9DqjHp8TaLFoUWCiTvYSThAn2oQ2",
    "registrants": [
        {
            "id": "OygITekbQ9SXBo-cfiKOWQ",
            "first_name": "Marnia",
            "last_name": "Gittose",
            "email": "mgittose2k@cnn.com",
            "custom_questions": [],
            "status": "approved",
            "create_time": "2025-04-15T10:46:38Z",
            "join_url": "https://sugarcrm.zoom.us/w/97368909778?tk=qt3d1KG4R4kLRe6VRJZwfGuSbwbx6RELZlLLPQWoqPA.DQcAAAAWq6On0hZPeWdJVGVrYlE5U1hCby1jZmlLT1dRAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&pwd=cumbvPVhE2mT8Eqr9spDsATaOMTNn8.1"
        },
        {
            "id": "S328dumeRcGXPP4C1xxiFQ",
            "first_name": "Caren",
            "last_name": "Boraston",
            "email": "cboraston2x@blog.com",
            "custom_questions": [],
            "status": "approved",
            "create_time": "2025-04-15T10:46:38Z",
            "join_url": "https://sugarcrm.zoom.us/w/97368909778?tk=zi6RzvM5RP_qeMCcTLBXcL_1uYUACLi2dcb_Ww3Iz8U.DQcAAAAWq6On0hZTMzI4ZHVtZVJjR1hQUDRDMXh4aUZRAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&pwd=cumbvPVhE2mT8Eqr9spDsATaOMTNn8.1"
        },
        {
            "id": "S1r04Y7YQQ6Pm9lHh6_7Gg",
            "first_name": "Tami",
            "last_name": "Fawdrie",
            "email": "tfawdrie44@squidoo.com",
            "custom_questions": [],
            "status": "approved",
            "create_time": "2025-04-15T10:46:38Z",
            "join_url": "https://sugarcrm.zoom.us/w/97368909778?tk=QgnxqhZHZITDbfjE1SROhgiUA7AK197DjW0MCW3ljc0.DQcAAAAWq6On0hZTMXIwNFk3WVFRNlBtOWxIaDZfN0dnAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&pwd=cumbvPVhE2mT8Eqr9spDsATaOMTNn8.1"
        },
        {
            "id": "s-eBpQq8TDip-meMVc0mMA",
            "first_name": "Sophie",
            "last_name": "Allworthy",
            "email": "sallworthy4@techcrunch.com",
            "custom_questions": [],
            "status": "approved",
            "create_time": "2025-04-15T10:46:38Z",
            "join_url": "https://sugarcrm.zoom.us/w/97368909778?tk=KsMk_gyABA0V3usvUUfWKRS-dmMN63BKOMgn5dLfXbg.DQcAAAAWq6On0hZzLWVCcFFxOFREaXAtbWVNVmMwbU1BAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&pwd=cumbvPVhE2mT8Eqr9spDsATaOMTNn8.1"
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            "id": "RU_oBhXqQnOAbE5-WvAUIg",
            "first_name": "Stevie",
            "last_name": "Bail",
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            "id": "rpwEb3I9Q9iDajjclYjfRA",
            "first_name": "Glenden",
            "last_name": "Zisneros",
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Thanks you both @ArciomKrasilnikau
I reported this internally and we are looking into this

Hi @all!!!
Thanks for your patience here. Our Engineering team were able to reproduce this and flagged this as a bug. It will be fixed in our May release (ZSEE-164482)