Please reference this post first: https://zoomdevelopersupport.zendesk.com/hc/en-us/articles/360054379371-Not-receiving-Webhooks
If this does not resolve the matter, open up a support ticket with the following:
- affected webhook types
- affected meeting and/or participant Id(s)
- account Id
- notification endpoint url(s) where webhooks are sent
- time frame of affected instances
- steps to reproduce
- screenshots of errors (if applicable)
Thank you!