Solved
Zoom seems to have two instances and people have difficulty connecting when I send them a link
On my Mac Mini (with latest everything).
When I click on Zoom, I get Zoom Workspace. If I get an invite from the participants list and send it to someone, they end up in a Zoom waiting room...different from where I am. At least that happens regularly. I never know whether it will work or not. I have the feeling there are two Zoom apps running at the same time. If we both close Zoom and try again, it may work.
Suggestions? Thank you.