The Mac JamKazam app was updated today. It's Build 1.20 - "1.0.3668". To see the app version, select the JamKazam --> About JamKazam menu item. 

(from the official post here)
JamKazam has recently seen a large number of new users.  We are working on a number of issues.   

April 29th, 2020
Windows & Mac Client Updated

1. Facebook Live Streaming fixed