Camera and mic doesn't work

I’m trying to use jitsi meet, but it doesn’w work.
I use google chrome on my pc, and when i’m in a room, on the screen there is this " jitsi meet need to use your microphone and camera". stop. I have already given permission for the webcam, but it doesn’t works
I don’t understand why…i cheked the setting of my webcam, they are correct.
Pleas help
thank you