How to resolve error on "Start Voice Chat" where as Text Chat works fine in next.js demo codebase

hello all,
I am getting following error while running the codebase on google firebase studio in local dev server.
It does not give more accurate issue on what kind of permission.
I will appreciate any help.

Stream ready:
MediaStream {id: "72783e5a-aff2-4b43-b655-adc820ab0295", active: true, onaddtrack: null, onremovetrack: null, onactive: null…}
id: "72783e5a-aff2-4b43-b655-adc820ab0295"
active: true
onaddtrack: null
onremovetrack: null
onactive: null
oninactive: null
addTrack: ƒ addTrack() {}
clone: ƒ clone() {}
getAudioTracks: ƒ getAudioTracks() {}
getTrackById: ƒ getTrackById() {}
getTracks: ƒ getTracks() {}
getVideoTracks: ƒ getVideoTracks() {}
removeTrack: ƒ removeTrack() {}
addEventListener: ƒ addEventListener() {}
dispatchEvent: ƒ dispatchEvent() {}
removeEventListener: ƒ removeEventListener() {}
when: ƒ when() {}
: "MediaStream"
Error starting avatar session: Permission denied