My mic doesn't work in conferences

Hi my mic doesn’t work in Jitsi. Every input level is 0 even with permission allowed. I also tried to install the app and change browser but nothing changed. My mic is working properly (I checked it). I tried to pair a bluetooth mic: the device is detected but when i talk the signal keeps to 0. I repeat: every permission is allowed. Other people voices are working properly. Any helps? Thank you.