Include_fields=registrant_id does not work anymore

When I run a query to get a given webinar participants :

And use the include_fields parameter (?include_fields=registrant_id)

The registrant_id is not sent back in the response

The same request was working properly a few days ago

Please help. Thanks

Hey @animatrice.webinaire,

Thank you for reaching out to the Zoom Developer Forum. Similar to your other post, please provide the GET query that you’re using when you see this issue.