Registrant id doesn't always match with webhook events "participant joined" and "participant left"

Description
Registered participant id doesn’t match with id in webhook events

participant registration
/v2/meetings/87559624411/registrants
Payload
{"email":"someemail@gmail.com","first_name":"Aaron","last_name":"Kahn"}
Response
{"id":87559624411,"join_url":"https://us02web.zoom.us/w/87559624411?tk=f9f_50FR54jgOdCgPOWVv5NVG38JKAh2m6bwPwcqaVc.DQIAAAAUYvXW2xZ0VVVvWWI2c1RicVdMUHFGMkxDSkZRAAAAAAAAAAAAAAAAAAAAAAAAAAAA\u0026pwd=L0dXajlkNDVaclhLYThXNklKWitEZz09","registrant_id":"tUUoYb6sTbqWLPqF2LCJFQ"}

The participant joined event payload

{"account_id":"2E2AAyC9QR-q9e5UrwhEqA","object":{"duration":60,"host_id":"QLmej305SWu_Q1gg6nb14g","id":"87559624411","participant":{"id":"","join_time":"2020-09-24T06:20:54Z","user_id":"100665344","user_name":"Aaron Kahn"},"start_time":"2020-09-24T06:12:02Z","timezone":"Asia/Almaty","topic":"My Meeting","type":2,"uuid":"W0BiP7UERK2cEOfKXvyymg=="}}

The participant left event payload

{"account_id":"2E2AAyC9QR-q9e5UrwhEqA","object":{"duration":60,"host_id":"QLmej305SWu_Q1gg6nb14g","id":"87559624411","participant":{"id":"tUUoYb6sTbqWLPqF2LCJFQ","leave_time":"2020-09-24T06:21:09Z","user_id":"100665344","user_name":"Aaron Kahn"},"start_time":"2020-09-24T06:12:02Z","timezone":"Asia/Almaty","topic":"My Meeting","type":2,"uuid":"W0BiP7UERK2cEOfKXvyymg=="}}

Error
As you see participant id was set only for the second event while user_id was set and same in both events.

Which App Type (OAuth / Chatbot / JWT / Webhook)?
Oauth

Which Endpoint/s?

Hey @s.kozlov9242

Thanks for posting on the Zoom Devforum! I am still learning, but I will try my best to help answer your question. :slightly_smiling_face:

Checkout these related threads that may have the answer you are looking for:

If these threads did not help, please let us know by replying back here and someone from the Developer Relations team will get back to you shortly.

Thanks,
DeveloperBot

Unfortunately suggestion is useless. Please summon human to help me

Hey @s.kozlov9242,

Can you confirm that you have registration required for the meeting(s) where you’re comparing these IDs? If registration is not required, these IDs will not necessarily be the same:

Additionally, can you confirm the user(s) were logged into Zoom when they joined the meeting(s) in question? If they were not authenticated when they joined, these IDs will not necessarily be the same.

Let me know—thanks!
Will

Hi Will,

The user wasn’t logged into Zoom. I understand that id shouldn’t be the same. But I can’t receive the ID on participant joined event that’s confusing.

Hey @s.kozlov9242,

Thanks for clarifying.

This is an experience that we’re working on improving—you might find this thread helpful for some context:

Let me know if you have further questions in the meantime.

Best,
Will

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