PC player here.
I must be the only one having this problem but it is SUPER frustrating technical issue.
I have all the sound settings set to my headset. I also have the Windows settings set to my headset. I even have set the default device to my headset to be app specific (Halo Infinite) through the sound settings on windows.
I STILL ONLY HEAR MY TEAMMATES THROUGH MY SPEAKERS!
All other sounds play through my headset. My voice goes through my headset. Everyone can hear me.
There NEEDS to be a setting for INCOMING VOICE.
Also should be noted, I play Infinite on my steamdeck as well. Where i can speak through its built in microphone and hear people through its built in speakers. Because im using the same account on both platforms I feel there is an issue when i jump back and forth between them