Issue in Zoom webinar absentees API

Webinar absentees is not returning correct Absentees results

Currently in our system we track attendance to our webinars by checking registrants and compare them to attendees, when the customer is registered in not listed as absentee then it’s considered as attendance. Suddenly we have high rate of attendance reports that are wrong, basically by comparing the absentee API result (which is returning Empty result for webinar {97981012989} occurrence {1637661600000} ) while CSV reports from the dashboard shows only limited number of attendance (less than the number of registrants).

Which App Type (OAuth / Chatbot / JWT / Webhook)?
JWT using PHP Zoom SDK
Which Endpoint/s?
The API documented here:

How To Reproduce (If applicable)
Try to call this api with values mentioned above and compare the result to the CSV

Additional context
As we said we’re depending on delta between registrants and absentees to know who attended our webinars, is there a more direct way to do this? Probably we can change our implementation even after the bug is checked/fixed.

Hi @Issa_Englease,

Thank you for reaching out about this. In order for us to take a closer look, can you please open up a request with us here and include the following:

  • Request URL you’re using to retrieve Webinar Absentees
  • The CSV you’re comparing it to
  • Your account details


@will.zoom Hi where to open the request?
the base url:
the api path: /past_webinars/{webinarId}/absentees

Account details:

For sensitive info details please provide secure contact channel like Email or so
and thanks in advance

Hi @Issa_Englease,

Apologies, you can open a request here. Select Technical Support and under Product, choose “Developer”.

Thank you!

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