Have you looked at the overall latency of the events that are making it through? We also manage a large volume of meetings and are seeing the same which led me to do an analysis on the latency we were seeing for all webhook callbacks. Occasional high webhook latency with no corresponding call log entry. In addition to the delivery delays, there are instances where we’re not receiving the request at all. I assume this is zoom giving up after multiple retries, but as I show in that thread, I’m pretty sure the delivery failures point to a problem on the zoom side, and not with our endpoint.