I cannot activate my microphone

Hello all,
I’ve just installed Jitsi in my IOS13.3.1 phone. It kindly ask access to my camera BUT for the microphone, it sent me to “settings”. The issue is that, related to Jitsi, no icon for authorizing access to the mic shows up …
Any suggestions?
Thank you in advance,

I have the same problem, but with the webcam on my pc.
Any suggestions?