actually I have the problem, that in some networks it isn’t possible to use screen sharing.
When I activate screen sharing and also my recipient, chrome asks us for permissions. After that both can see a preview of the shared screen, but only the own one. So I think it’s a streaming problem.
The weird thing is, that not every network has this problem.
When I try meet.jit.si it’s working fine, also from networks having problem with my self hosted Jitsi.