URGENT - Screen sharing does not work in Chrome in MacBook Pro

I need to use jitsi meet tomorrow with my students, and I have a problem. I can’t share my full screen. When I select the full screen sharing, nothing happens. Can I do something???
I use Chrome 80.0.3987.149 version in MAC OS 10.15.3 version.
I hope you can help me!!
Thank you!!

It may be linked to MAC OS 10.15 security on screen cature.
You can try : https://support.apple.com/guide/mac-help/control-access-to-screen-recording-on-mac-mchld6aa7d23/mac


I’m having the same issue on a Mac with OS 10.13.6 and Chrome 81…
I tryed to follow the advice but on my OS the System Preferences dialog window seems to be slightly different.
Is there anyone having the same problem, or better is there anyone who figured how to work this out?
Thank you all and best regards!