So going forward, at least for now, we will be using Zoom for Groups. Look for an invitation URL posted in the group channel on slack prior to the pre-determined group meeting time. All you will do is click the URL, download and install the app on your computer. It will automatically find and set up your webcam and microphone.
I am still working on the Matrix/Riot app, an opensource option I mentioned in an earlier post, and still want to test the Slack for groups (Paid) option at a later date.
Thanks to everyone who participated in today's testing!