Cannot get some participant emails even though they're part of the calendar invitation

GET /past_meetings/{meetingId}/participants
https://developers.zoom.us/docs/api/rest/reference/zoom-api/methods/#operation/pastMeetingParticipants

Description
When I call the endpoint https://api.zoom.us/v2/past_meetings/_meetingId_/participants

I get the full list of participants for that meeting, 15 in total but only 4 of them have the user_email property with a value. I went over the rules for Zoom to share the email of the users in that meeting, and the main rule is that the email of every person is part of the calendar event invitation which is the case:

https://developers.zoom.us/docs/api/rest/using-zoom-apis/#email-address-display-rules

If the participant is on the calendar invitation or event using one of Zoom's calendar integrations (Outlook or Google Calendar).

So, how can I get the email for the rest of the people in this meeting? Or can you provide guidance as to why we cannot get them ?

I can provide the meetingId if you need to look into it.

Thanks!

Hi @octaviosoar
Thanks for reaching out to the Zoom Developer Forum and welcome to our community, I am happy to help here!

Could you please share with me how are you adding the participants to the meeting?
Did you do this via API?

Hi Elisa, yes, the way we add participants to the meeting is by using Google calendar with the zoom plug-in.

Thanks @octaviosoar
I will send you a private message so you can share more specific details with me
Cheers,
Elisa