Audio and voice
Sound, microphones, the Windows communications device nobody knows about, and the difference between a radio problem and a proximity-voice problem.
If your radio works, your microphone and your headset are fine. What is failing is the part of the server that decides who is close enough to hear you — that is ours to look at.
Windows can send different sounds to different devices. Usually this is the game talking to a device you are not wearing.
Windows has a privacy switch that can block the microphone for games specifically, even when it works elsewhere.
Since people nearby can hear you, your microphone is fine. This is about the radio itself — the item, the channel, or its permissions.
Choppy voice is usually the headset link or the network, not the game.
Your microphone is hearing your own speakers, or the same conversation is reaching you twice.
The game chose its audio device when it started. Changing headsets afterwards does not move it.