best response confirmed by ThereseSolimeno (Microsoft)
Teams only have support for one camera, support for an additional content camera is coming but that is not what you are looking for.

If you want to show all your cameras at the same time in Teams you need some other software to merge them to one camera stream firsts (there are multiple of tools for that) or if you want to switch between different camera angles you would also need third-party tool (or switch device in Teams).

A free tool you could test is the OBS studio software, it is open source. You can select multiple cameras and output to a virtual camera that you can select in Teams.
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