Hi @Severson, Chris ,
You can disable guest to chat in Teams meeting, but there is no direct way to block guest seeing Teams meeting converstation.
The following links show detailed setting about how to disable guest chat in Microsoft teams:
https://techcommunity.microsoft.com/t5/microsoft-teams/meeting-guest-user-chat/m-p/293345
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There are some technical Microsoft Teams forums on Microsoft Q&A over here:
Teams on Windows
https://learn.microsoft.com/en-us/answers/topics/office-teams-windows-itpro.html
Teams on Linux
https://learn.microsoft.com/en-us/answers/topics/office-teams-linux-itpro.html
Teams App Development
https://learn.microsoft.com/en-us/answers/topics/office-teams-app-dev.html