Signal desktop and video teleconferencing?

Has anyone gotten this to work? I use Signal all the time on my Android. In Leap, I can see the video of myself after connecting to another user, but can’t see their video - nor can the see my video (from either a Mac Signal deskdop or from an Android Signal) I tried writing the maintainer of the package in Leap to ask, but didn’t hear back.

Thanks!
PattiM