Team Chat vs in-meeting Chat

[Amazing]

We have an existing app that was designed as a chatbot, for in-meeting chat. It works with a /command

Whilst working on it, I'm setting up a new dev app, but the options (for app type) have changed. Using the info I have, I can set up a 'team chat' app, but that doesn't allow the use of the /command within the in-meeting app (which is where it's supposed to be), it only allows it in the team chat window, with those in the meeting don't see.

Do I need to change the type of app, and if so which type will allow me to send /commands from the in-meeting chat?