Meeting.participant_joined and meeting.participant_left webhook events not firing in a Webhook only app

API Endpoint(s) and/or Zoom API Event(s)
meeting.participant_joined and meeting.participant_left webhook events

Description
The meeting.participant_joined and meeting.participant_left webhook events are not firing in a Webhook only app. The app was created a month ago, but the events were not firing. We have removed that app and created a new one, but those events are still not working. Other events like meeting.started and meeting.ended are working properly.

The events are properly marked in the subscriptions, and the url is properly validated.

We have several other zoom accounts from other clients with those events working properly (checked today) with the same exact app and subscriptions configurations.

Endpoint

https://api-hulp.seasalt.tech/api/zoom/webhook?integration=3

Error?
No error log, those events simply are not firing.