Chances are it's the same issue as using Team Viewer in Sandboxie.
The problem is a overlay driver that cannot broadcast from inside the sandbox. Been looking for a solution for a while now I decided to just do a virtual pc for these types of issues requiring the need to do so.
Dunno if there is a way to make an exception of it but at the same time you'll be compromising with more security issues.
thanks for information regarding this issue, as for solution use Zoom webclient instead, running relatively safe inside chrome sandbox, for extra precaution you may run chrome browser inside sandboxie and forget not to disable chrome audio sandbox thru registry
