Ween Jitsi is called by using Firefox, the messagebox pops up, where you asked to enable the camera and the microphone. In Chrome browser it is not so, even I enabled it by the browser security-settings. Even I reinstalled Chrome. And it is the same different on PCs.
What operating system are you using ?
Under Windows 10, you may need to adjust privacy settings to enable access to your webcam and microphone, see :
Hi, I checked it. It is enabled by general and also for the app Chrome. With Firefox there is no problem.
I still don’t know if you’re using Windows, and what version.
If this works in Firefox, then it may be a Chrome-specific setting. See :
I checked it twice and I did the adjustments on my mobile phone and a second PC (means 3 device having the same behavior). And on all 3 devices firefox is working well. So I guess the Jitsi uses requests which are no longer compatible with Chrome.