The most common cause is the setting simply being disabled or restricted to your immediate squad.
Open the tab (the headset icon) while in the lobby or match. Fix Warzone 2.0 Proximity Voice Chat Not Working
Even with the right settings, you must be actively connected to the game's audio channel. The most common cause is the setting simply
Go to Settings > Audio > Voice Chat and ensure "Proximity Chat" is toggled On . Fix Warzone 2.0 Proximity Voice Chat Not Working
Proximity Voice Chat is a defining feature of the Warzone 2.0 experience, but it frequently glitches out due to misconfigured channels or bugged toggles. If you can’t hear nearby enemies or they can’t hear you, follow these steps to restore the audio.
If settings appear correct but still won't work, a bugged session often needs a manual refresh.