Using Microsoft Search API to search Teams messages, how do I tell if a hit is a channel message (post) or a reply to one? They look exactly the same in the response.

I am creating an event using Event API – https://learn.microsoft.com/en-us/graph/api/user-post-events?view=graph-rest-1.0&tabs=http and creating a teams meeting using online meeting API – https://learn.microsoft.com/en-us/graph/api/resources/onlinemeeting?view=graph-rest-1.0#onlinemeetin…. But the participants are unable to start the chat in teams before the meeting is started. Participants can start the chat if I manually create a meeting from the team’s calendar. Please guide me on how I can enable the participants to start the chat before the meeting is started. I have the following flags set when create the online meeting –

When use the new MS Teams Graph API to get a list of webinars: https://learn.microsoft.com/en-us/graph/api/virtualeventsroot-list-webinars?view=graph-rest-beta&tabs=csharp