I have used Photon 2.19.3.
It is working fine with some android devices. But with MI devices(Note 5 pro) voice is not transmitting to another end.
Note: 2.19.3 is PUN 2 version.
Photon Voice version is 2.18 or 2.18.1 or 2.18.2? you can find it in "Assets\Photon\PhotonVoice\changes-voice.txt", it's the first on top.
Does this happen with the demo scenes?
MI devices(Note 5 pro)
you mean Xiaomi Redmi Note 5 Pro? or all Xiami devices?