Access denied camera Rocketchat-desktop Snap

Description

Hi, i am using the rocketchat-desktop-Snap (Version 2.17.9) on Ubuntu 19.4. If i want to use Videochat with my Team, i can connect to jitsi-Server but the app get no access to camera (Permission not granted).

I tried in terminal sudo snap connection rocketchat-desktop:camera but there is no Plug for Camerausing. Does anybody know if there is a Solution or Workaround?

In Firefox all works fine inlc. Videochat.