Thank you for reaching out to the Zoom Developer Forum. I’m not sure why you’re seeing a that ID for the user so I reached out to our engineering team to see if they can offer any insight.
I’ll update you here when I have more information. (ZOOM-269988)
Thank you for your patience. Our engineering team got back to me and indicated that this is likely caused by an out-of-date Zoom client. Please make sure that participant is using the latest version of the Zoom client (5.6.4) and let us know if the issue persists.
Good to know the possible cause and that we can get malformed data from the API. I have applied a patch on my end so the ETL does not fail when this happens.