Hi @snow1
Thanks for reaching out to the Zoom Developer Forum and welcome to our community
I am happy to help here!
Can you please share the entire request URL that you are sending when getting this inconsistent response and the response body you are getting so I can take a look into that?
I wanted to update the community about this issue.
It looks like the reason why the developer is not getting the start_time field in their response is that this is a no fixed time webinar(type 6) so It does not have any start time so no start time is returned in API response