Multiplayer - Voice chat pitch is warped when moving
If you are using Unity audio sources for the pitch, I believe this may be caused by the Doppler Level not being set to 0 (by default it's 1). The Audio Source Doppler Level should be set to 0 for voice chat, otherwise the voices will get pitched up or down based on movement. My colleague and I had trouble hearing each other due to this issue.
Thanks!